This is what I heard too. The manufacturers advertise highest cargo capacity and tow ratings. The fine print is which model gets the highest rating. In my year truck, the regular cab, 2wd, dually, 6.4 hemi has the highest cargo capacity while the regular cab, 2wd, dually with the HO Cummins has the highest tow rating. It's the same with campers. The base model weight is published but you have to read the fine print to see what the added options weigh. And you'd be surprised to find what items are considered options and how quickly the weight adds up.
The one thing I would suggest is not going overly tall with tires or lift. Even with a light camper, it's going to be up high adding to sway and just that much more difficult to get on and off the truck. Camper Jack's only extend so far and then you have to start using blocks.
Sorry to keep hijacking the thread with this, since you seem to fully understand what you're wanting to do, but I thought it might be useful information to some that might not.
Looking forward to see what you come up with.