Nice setup, McClintock! My wife and I just brought our 17RP home a couple of days ago and I'm currently weighing my options for how to haul 2 motorcycles in it. It seems the designers definitely had hauling one bike in mind based on the D-ring placement, but it sounds like you have figured out how to get 2 full sized dirt bikes and a couple of kids bikes in yours, so I'm hopeful that getting my 2 dual sports in ours will be easy.
Do you happen to have a picture of your bikes all loaded up? I'd be interested to see your hauling setup if you don't mind.
2014 Ford F150 STX Sport Regular Cab, Short Bed, 5.0 2WD
2015 Forest River Wolf Pup 17RP