A SRW Megacab is too heavy to carry even the smallest of truck campers.
You can pull a much larger RV than you can carry, but even then, the weight of the megacab is going to restrict you based on pin weight.
It's shameful that they are willing to make trucks that are so big and heavy with so little payload. My 1 ton SRW has 2700 lb of payload, and even that doesn't seem like anywhere near enough. Trucks and their running gear got heavier as boxed frames became the norm, but for whatever reason, until recently, GVWR was the same as the 1990s when trucks weighed 20% or more less than they do now.