What you're missing is knowledge about your vehicle and it's components.
You can do a whole lot more with your truck (even though you didn't say what year it is) for a whole lot less than $5k in "upgrades", even if you pay someone a fair price to install a couple upgrades.
For starters, you don't even have as heavy of tires as the truck came with, but now 17" truck tires are extinct in any heavy load ratings.
Do some more research on your truck instead of campers and I believe you'll find it's easier and more economical to upgrade your truck a bit than find/order customize a camper to fit a need that is not a real need.
If you read even only the TC forum on here, you can extrapolate enough information to make an informed decision.