Hmm well shoot. So would you say I'm overthinking being over my gvwr by 1300 lbs since I've done an add a leaf and that the new truck isn't worth it especially since I do offroad my truck without the camper sometimes? Better to put that money into a lift, bigger tires with more sidewall and regearing? Mainly worried about a potential blowout since my tires sidewalls have been looking a bit worn lately..
That camper's a 990? by the pics on a long bed, so about the same as my AF 860 on a short bed 3rd Gen. Don't use the camper often, but over the last 5 years probably 20k miles or so from WA to WI to AK.
Safety wise, of course you're loading the tires up to their max load +/- with the camper on. I am too and while I wouldn't blindly recommend others do it, the fact is others do it as well and knock on wood, no issues with 3 different sets of 3600-4000lb rated E load range tires. Pickup truck Tires on a srw hauling over 4000lbs payload are the weakest link IMO, but sufficient.
The rest of the truck is built to handle more (same chassis as a dually, right?)
Comfort while driving, I don't mind driving the old Mega with the camper, but if I was hauling the camper regularly, I'd think harder about a dually.
Being over the mfgs recommended gvw is a can of worms that is generally confined to internet arguments. Some believe you'll crash, die and or go to jail being over gvw rating, others are more practical about what is ok and what isn't. All I'll say is let your knowledge and comfort level decide what's right for you.
Lift, bigger tires and re-gearing?? Not sure what that accomplishes other than make the truck less stable. Last thing you want to do is raise the center of gravity, IMO.
I would not run questionable condition tires though. If you're already at the max or possibly dipping into the factor of safety a bit, give the tires every chance to survive. BTW nice setup!