I’d say your setup is ok ish as is, knowing the weight of that camper and the truck you’re using.
You could upsize the tires to 295s for a rated 4000lbs/each. They should fit albeit a smidge big.
If keeping the bags, I’d recommend a heavy sway bar, if your truck doesn’t have a factory sway bar and you feel it needs more roll stability. As well, shimming/stable loads to engage lower and or upper overload springs early in the suspension travel helps a lot.
I don’t have the phobia of airbags that some do and realize their place as a good option depending on the trucks overall use. However if I was setting up a truck solely for hauling the heavy camper, I would be more inclined to just beef up the springs which will be more stable for body roll than having bags support part of the load
Don’t worry about the trucks overall ability to hold that camper without breaking anything. The lowest rating part of the equation is (aside from administrative weight limitations cooked into the ratings of some vehicles) is the wheels and tires.
OE rims usually sit around 3500-3600lbs rated. Which you’ll be exceeding by a bit.
You can get 18” rims rated for 4klbs aftermarket. Which is a decent option if you aren’t comfortable with any weight rating overload on the wheels and don’t want to step up to 19.5s and the cost and limitations of that choice.
Then tires which your OE size is about the same rating.
Personal opinion back by decades of using light duty trucks outside their “rated” capacities, there is more than enough factor of safety to haul 4000lbs or slightly more in any 8 lug srw pickup truck made in the last 25 years.
Lastly tire load letter ratings (C D E F G H) are somewhat misleading. And I believe the F load sizes you’ll find are bigger tires than you want to run, but not rated for more weight than say an E load 129 load index tire like the 295s I mentioned above.
