I recall the static load capacity being 100#, but I can't see to recall where that was documented. Might have come from an email I sent to Jayco regarding the same situation on my first TT. Problem with hauling bikes is its a dynamic load, way more that 100# of force bouncing down the road.
I, and many other, had frame to frame receivers fabricated and welded to our TT. On my current TT I gave away the factory Cargo/Bike rack and replaced it with a 2" receiver so I can use a hitch mounted bike rack. Getting a receiver fabricated and welded on around here is $300 -- very much worth it.
2007 Chevy Duramax LMM/Allison
2012 Jay Flight 29QBH
2012 Jay Flight 26BH (Sold)