I have a set but am holding on to them until I sell the camper in case the next owner needs them. They are pretty hard to find and become harder every day.
I am assuming he is carrying the 815 on a short bed truck. Hopefully at least a 3/4 ton because the unit gets to be pretty heavy when all loaded up. Last time I ran across the scale I had 3,500# between the camper, stuff inside, and what I had on the back seat.
A set of sheet metal boxes is probably going to be about your best bet. The boxes need to house the tail lights, a side market light if you use flush tail lights, and have a wing that goes far enough forward to obscure the truck's tail lights.
2015 Ram 3500 4x4 Crew Cab SRW 6.4 Hemi LB 3.73 (12.4 hand calc avg mpg after 92,000 miles with camper)
2004 Lance 815 (prev: 2004 FW 35'; 1994 TT 30'; Tents)