Quite honestly, the Tundra sounds like it fits all your needs. It's reliable, long-lasting, holds its value and will certainly have no issue carrying a lighter-weight camper.
To the point others make about getting a 3/4 ton gasser: If you don't need that much capability then I don't see the point in paying for it.
The fuel costs will be higher, despite what some claim. Unless you're comparing a bottom-level stock F250 or Ram 2500, the Tundra will cost less to buy.
Tundra is slightly smaller as well...not by much, but every little bit counts when driving around on crowded streets or tight trails.
If you're going to actually be carrying payload and towing loads that are in excess of the Tundra's ratings, by all means get a 3/4 ton. But don't buy into the hype that you should get one just because...they are big and thirsty vehicles, even compared to the Tundra.