Boy, that's a lot of weight hanging out the back of the rig. This is unsupported weight and you have a big heavy lever pushing down on your receiver. When you add the bike rack behind the cargo box, you are increasing the strain.
I know I've seen conversion charts for tongue weight, cargo weight, and distance from the receiver, but I couldn't find it on a quick search. Check around and see what you find on this. YMMV!
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2015 Winnebago Vista 26he, no toad, 5 bikes, 2 tandems
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