Here are a few options on
Amazon. I'd think you could track one down on eBay, Craigs' or Hitch Trader. Look carefully because some have the connecting clevis built in, and some are for bolt-on Quick Disconnect Brackets. The Amazon page illustrates both bars and the QD bracket kit.
On a whim found this one on eBay.
$109 Free Shipping. Be careful of Shipping on a part like this. Too big for USPS flat rate and heavy enough to be $35 on FedEx
If God's Your Co-Pilot Move Over, jd
2003 Jayco Escapade 31A on 2002 Ford E450 V10 4R100 218" WB