Are you going to travel to off road destinations only. Heck of a lot of country to see with no orv stuff involved.
Personally I'd ditch the Side by side and invest that in my camper. Big places for orv have folks that rent what you can play with for awhile.
However if your gonna hunker down for weeks at a time and really explore a area by all means.
Absolutely ditch the bumper extension toy hauling idea.....absolutely none of them are balanced and built for that mess. I got a rear rack and a gracious amount of cast iron cook ware and out door goodies drastically changes the temperance of my 37 foot long bumper pull.
Toy haulers haul toys. Otherwise cargo the truck and run real air bags.
Keep in mind maintenance on everything your roaming around with as well. You will need some tools or shell out when something does break. Something will break.