Do you have an undermount coupler on your Jayco? If so then check the Reese site, there are instructions for bolting on that type of frame. If you have the bent chain plates then make sure they point in. I discovered mine were backwards from a recent post on bent dual cam brackets, it appears this pulls the brackets away from the frame, causing bracket damage.
One of my saddles bent both where the set screw bolt is and on the other side. I had to replace it.. Has anyone bolted these to the the frame (boxed frame)?
I've bolted mine to the frame, but FIRST you must find out the cause to the problem. Properly set up, they will not bend. bolting them won't keep them from bending. the most common cause of them bending is that there is not enough clearance between the bar and the cam arm and in a turn, especially an off camber turn, the bar hits the cam arm, putting tremendous outward force on the chain and bracket. In a normal turn it may look like you have clearance, but an off camber turn can create problems. This is especially true with the pre 2010 version with the straight side plates and a top mounted ball. the other cause is a post 2010 setup with the side plate pointing outwards rather than inwards. If cam arm clearance is an issue, especially with a top mount hitch, get a 1" goosneck riser ball, it will give you additional clearance.
2011 Keystone Outback 295RE
2004 14' bikehauler with full living quarters
2004.5 Silverado 4x4 CC/SB Duramax/Allison