Anyone Haul Around A BIG Camper?

[69sixpackbee]

I am looking to put an 11.2' Lance on my '72 C-20 and want to make sure it is ikay. Yea, physically it is a shoe in but I am concerned with the added weight. This camper is 2500 Lbs dry and my truck is a 5500 GVW + air bags. I have cabover camper stabilizer shocks on the front as well. I have All Terrain KO 265/75-16's on the back that are an "E" rated tire @3450Lbs. My concern would be braking but I have the good discs up front and the 12X3's in the back (Dana rear) I know this 402 and 4-speed is up to the task in the power dept. but am I pushing it with the load?
I remember seing alot of BIG campers on the backs of these older trucks when I was growing up. Hell, my dad had a '51 3100 with a 6 and a granny gear and we had an 11 1/2 footer on the back of it and I don't remember any problems.
Any advice is appreciated.