Congratulations on good camper find.
Just bear in mind that modifying your existing truck opens whole chain of possible expenses and some owners, when they look back notice that better decision might be instead of spending $6000 on wheels modification, just sell the truck and buy dually.
I understand that you use your 2500 truck as toad, but then I would expect that you might change your camping habit having TC or bus to drive and not necessary take them both.
In my Prevost storage bay I was able to fit older Honda Trail bike and that made good vehicle for exploring sites.
Than bicycles for rest of the family.
Lately electric scooters come to really good performances.