I had a FS3400 bumper pull, it fit a 4 seat Buggy Works backed in with 2 dirt bikes pretty easily with the 17ft open layout. I had to back in and get the rear loading tires all the way to the cabinets, engine cage between fridge and counter. I did have to change to some narrower headers. This trailer was a tank, 2560 Lbs. of tongue weight definitely needed the biggest load distribution hitch and some air bags.
I have a CR3905 FW now, it has close to 19ft open and I can get the car, two 185S three wheelers and a 450 dirt bike pretty easily. if I got creative I can likely get 2 dirt bikes.
I would get the biggest 2006-2016 trailer you can tow! all the newer trailers in my group have major build quality issues constantly and seem to cater to SXS, the older warriors have issues as well, but once the wall sag is addressed on the older ones, keep the roof sealed, they are great trailers.