Like others have said, run the truck as is before jumping on the "upgrade the suspension" band wagon.
Torklift Stableload work wonders for my truck.
Probably the worst part of owning a truck camper is loading it on the truck. Sometimes I nail it 20 minutes, other times it borders on taking an hour... this is all due to where I store the truck camper and don't have level ground leading up to my shop.
Here's my load up video which went pretty well.
I never take the camper off the truck when traveling, because I have a motorcycle to ride around and check out the areas I go.