I can do the math, but you have to have the exact trailer specs, length, width, tongue to axle, axle to rear, and where are the toys going, and what they weigh, front axle, rear axle, of the toys, and exact placement in the camper, and maybe a few more dimensions. The math is easy, for me anyway, it's getting the right numbers to put in the formula that can be challenging, and can cause a world of errors.
Also you mentioned 2 atv's behind the axle. Won't happen. The trailer max width is 8 feet. They won't fit side by side, so one is going on the axle, or forward of it. Now to me atv equals a 4 wheeled vehicle, and most are 4 feet wide, or wider. The max camper width allowed by law is 8.5 feet, add wall thickness.......and you might get 8 feet wide inside, more like 7.5 feet inside. Sure they will fit?
Sorry, not trying to rain on your parade, just make some careful measurements
2012 Ford F250 ext. Cab 4x4
2002 Jeep Wrangler Sahara
2008 Yamaha V-Star 650 Classic
2008 Work and Play 18LT