I have the JB stabilizer kits installed. My Flagstaff has one of those weak rear bumpers that has a spare tire w/attachment clamped to it. Maybe you could relocate. Or, when the wife wants to bike I remove the spare tire attachment and install a hitch clamp (amazon) for the bike rack carrying assembly. I just carry the spare tire in the bed of the truck until we get to the campground then lock the spare to the JB stabilizer under the front. And I wouldn't give up the JB stabilizers for anything.
Don & Dona W/yorkies Gizmo, Master Chief, & Tali
2011 Flagstaff 8528 BHSS 2015 Ford 6.7 XLT
2010 Full Timers & Still Going