Dhull
The beds and axle location on ccsb and mega cab trucks are identical.
While a long bed truck is preferable, since you're opting for the short bed only camper, it will do fine.
The 11.8" rear axle and stout 3500 springs will haul that camper fine, possibly only with stable loads to get the main leaf involved right away.
I haul an older/heavier version on my older/lighter duty mega cab and it's too much for the factory 2500 springs alone, but otherwise hauls it admirably. Could use a sway bar though, lol.
If it's going to be a pretty dedicated camper rig and you're getting a mega, I'd consider a dually. Only short bed dually out there still I think.
Either way, the truck will handle it. Tire capacity in the rear will be right at the limit though and you'll likely be a little over the states rim capacity thou.
Having the CG a couple inches back of center of axle will not make an appreciable difference on the front axle. Truck will not be light in the front end, but you'll guarantee ALL the weight is over the rear plus the moment created by the trailer tongue load.
I've been trucking around with more than that on my truck w the camper and pulling trailers at the same time. If you want it to handle like a relatively unloaded truck, opt for dually, IMO especially if your towing anything decent weight.
And not to get into the gas vs diesel, but realize that dropping 2 tons in the bed and hooking 2-3tons to the hitch will make a gasser work for every mile!
And have fun with the new rig, whatever you decide!
