I think I posted about this over on the facebook page . . .
I had the slide-out rear bumper/bike rack on my previous 2013 Heartland Trail Runner 22RK (RK=rear Kitchen).
While it sounded good in theory and looked good on paper, using it as a bike rack was a major PITA.
So much that I opted out of the fold-down one offered for my 2015 Heartland Prowler P292.
The bikes rode good back there, but hooking them up to the provided vertical bar and locking them down took forever, plus provided me with lots of skinned knuckles!
Almost every time the bikes went on a trip I didn't take them off of the rack because of the hassle of putting them back on.
Notice the common theme here . . . the bikes are always on the rack!
Best use I ever got was when I had the axles, springs, wheels and tires upgraded that bike rack was a good place to haul the old tires and wheels home.