Good Sam Club Open Roads Forum: Tow Vehicles: SRW vs DRW
Open Roads Forum Already a member? Login here.   If not, Register Today!  |  Help

Newest  |  Active  |  Popular  |  RVing FAQ Forum Rules  |  Forum Posting Help and Support  |  Contact  

Search:   Advanced Search

Search only in Tow Vehicles

Open Roads Forum  >  Tow Vehicles

 > SRW vs DRW

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 8  
Prev  |  Next
Flashman

Tucson, Aizona, USA

Senior Member

Joined: 01/02/2005

View Profile



Posted: 05/14/21 04:23pm Link  |  Quote  |  Print  |  Notify Moderator

Cummins12V98 wrote:

pressure_welder wrote:

Cummins12V98 wrote:

"2018 montana 305RL - 14,270LBS loaded weight, 2395lbs pin weight

19FT crestliner sportfish - 3800LBS loaded weight/trailer, 300LBS tounge weight. on a tandem axle trailer, 23FT overall length

Don't believe the RV pin weight, is this a fact or a guess??? Boat trailer is light on the pin.

That said if you are at or under your RAWR let er rip!!!

Also truck stops truck, RV stops RV and Boat trailer stops Boat trailer. If it does not have brakes it sure should!




Hey there, those stats on the camper are pulled directly from the placard on the camper itself so i imagine they have to be close




NO they don't!!!

Don't think I have ever seen a published "loaded" pin weight.

20% generally is a minimum and many times 25% loaded pin.


I think that having a rzr loaded (behind the axle) into my tow hauler lightens my pin weight - should be the same for the hitch weight of a boat.

Lantley

Ellicott City, Maryland

Senior Member

Joined: 08/23/2005

View Profile


Offline
Posted: 05/14/21 04:38pm Link  |  Quote  |  Print  |  Notify Moderator

Flashman wrote:

Lantley

Sorry buddy - seat of pants is way too subjective. I prefer the physics lesson.

You know I can agree with that^^^^^.
Nevertheless my dually brakes much better than my prior SRW trucks.
My comment is based on experience pulling the same equipment with DRW and SRW trucks more than anything else.


19'Duramax w/hips,12'Open Range,Titan Disc Brake
BD3,RV safepower,22" Blackstone
Ox Bedsaver,RV760 w/BC20,Glow Steps, Enduraplas25,Pedego
BakFlip,RVLock,5500 Onan LP,Prog.50A surge,Hughes autoformer
Porta Bote 8.0 Nissan,Sailun S637
Correct Trax,Splendide


Flashman

Tucson, Aizona, USA

Senior Member

Joined: 01/02/2005

View Profile



Posted: 05/14/21 05:09pm Link  |  Quote  |  Print  |  Notify Moderator

Were the two trucks same brand and year?

Grit dog

Black Diamond, WA

Senior Member

Joined: 05/06/2013

View Profile


Offline
Posted: 05/14/21 05:52pm Link  |  Quote  |  Print  |  Notify Moderator

Lantley wrote:

Flashman wrote:

Lantley

Sorry buddy - seat of pants is way too subjective. I prefer the physics lesson.

You know I can agree with that^^^^^.
Nevertheless my dually brakes much better than my prior SRW trucks.
My comment is based on experience pulling the same equipment with DRW and SRW trucks more than anything else.


I can see the smaller diameter tires helping braking.
If the rear brakes are bigger like memtb said, that is something as well. Although I believe most newer trucks, srw/drw are same rear brake diameter.


2016 Ram 2500, MotorOps.ca EFIlive tuned, 5” turbo back, 6" lift on 37s
2017 Heartland Torque T29

Mike134

Elgin, IL

Senior Member

Joined: 11/20/2019

View Profile


Offline
Posted: 05/14/21 06:26pm Link  |  Quote  |  Print  |  Notify Moderator

mkirsch wrote:

90% of the braking is done with the FRONT wheels. The front brakes are for all intents and purposes the same between SRW and DRW models.

I'm not at all convinced that braking should be your primary concern here. I'm not at all convinced that ANYTHING should be of concern here.


I wouldn't be worried stopping 18,000lbs with a 1 ton. I stop 12,000 with a 1/2 ton.


2019 F150 4X4 1903 payload
2018 Adventurer 21RBS 7700 GVWR.

PastorCharlie

NC

Senior Member

Joined: 03/28/2004

View Profile





Offline
Posted: 05/14/21 07:01pm Link  |  Quote  |  Print  |  Notify Moderator

Considering that all equipment to be equal if the rear brake line is blocked and only the 2 front tires are active:

Adding the back brakes to the active front brakes will increase stopping friction 100%

Adding dual rear wheels will increase stopping friction another 50%

All stopping with the brake pedal depends upon the friction of the tires on the road surface.

parker.rowe

Delaware

Senior Member

Joined: 09/14/2015

View Profile


Offline
Posted: 05/14/21 08:21pm Link  |  Quote  |  Print  |  Notify Moderator

PastorCharlie wrote:

Considering that all equipment to be equal if the rear brake line is blocked and only the 2 front tires are active:

Adding the back brakes to the active front brakes will increase stopping friction 100%

Adding dual rear wheels will increase stopping friction another 50%

All stopping with the brake pedal depends upon the friction of the tires on the road surface.


If you are not locking the rear wheels stopping a SRW setup (I assume that is rarely the case with 2500-3K on the pin?), then the "extra friction" from the two more tires are not going to make it stop any faster.

So if the physical brakes are the same, as they often are in SRW vs DRW 3500's...and you don't need more rubber to stop the tires from locking up, then where are you gaining braking power?

If anything the extra rotating weight of 2 more rims, class E tires, hub adapters, etc are making it harder to stop.

I think that is what Grit was getting at.


2015 Starcraft TravelStar 239TBS 6500 GVWR
1997 GMC Suburban K2500 7.4 Vortec/4.10
1977 Kawasaki KZ1000


Cummins12V98

on the road

Senior Member

Joined: 06/03/2012

View Profile


Offline
Posted: 05/15/21 12:04am Link  |  Quote  |  Print  |  Notify Moderator

Flashman wrote:

Cummins12V98 wrote:

pressure_welder wrote:

Cummins12V98 wrote:

"2018 montana 305RL - 14,270LBS loaded weight, 2395lbs pin weight

19FT crestliner sportfish - 3800LBS loaded weight/trailer, 300LBS tounge weight. on a tandem axle trailer, 23FT overall length

Don't believe the RV pin weight, is this a fact or a guess??? Boat trailer is light on the pin.

That said if you are at or under your RAWR let er rip!!!

Also truck stops truck, RV stops RV and Boat trailer stops Boat trailer. If it does not have brakes it sure should!




Hey there, those stats on the camper are pulled directly from the placard on the camper itself so i imagine they have to be close




NO they don't!!!

Don't think I have ever seen a published "loaded" pin weight.

20% generally is a minimum and many times 25% loaded pin.


I think that having a rzr loaded (behind the axle) into my tow hauler lightens my pin weight - should be the same for the hitch weight of a boat.


300# hitch weight from the boat will lighten the pin weight by less than 300#.


2015 RAM LongHorn 3500 Dually CrewCab 4X4 CUMMINS/AISIN RearAir 385HP/865TQ 4:10's
37,800# GCVWR "Towing Beast"

"HeavyWeight" B&W RVK3600

2016 MobileSuites 39TKSB3 highly "Elited" In the stable

2007.5 Mobile Suites 36 SB3 29,000# Combined SOLD

Cummins12V98

on the road

Senior Member

Joined: 06/03/2012

View Profile


Offline
Posted: 05/15/21 12:07am Link  |  Quote  |  Print  |  Notify Moderator

I drive a Dually and tow more with much more weight than most. I don’t see the DRW stopping better as the 3500 SRW has the same brakes.

Truck stops truck and trailer stops trailer.

4x4ord

Alberta

Senior Member

Joined: 12/23/2010

View Profile



Posted: 05/15/21 05:40am Link  |  Quote  |  Print  |  Notify Moderator

^^^^ Even if the tire to road surface were the limiting factor in braking you’re not necessarily going to get better braking by adding more rubber. Consider sliding a box containing a new refrigerator across your floor .... do you really think it would be more difficult to slide the box if you lay it on its back vs having it stand vertically?


2021 F350 SRW Platinum short box 4x4.
B&W Companion
2008 Citation Platinum XL 34.5

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 8  
Prev  |  Next

Open Roads Forum  >  Tow Vehicles

 > SRW vs DRW
Search:   Advanced Search

Search only in Tow Vehicles


New posts No new posts
Closed, new posts Closed, no new posts
Moved, new posts Moved, no new posts

Adjust text size:




© 2021 CWI, Inc. © 2021 Good Sam Enterprises, LLC. All Rights Reserved.