Choose the wheels you want based on looks. If you got the money, I don't care how you spend it. Most OEM wheel/tire combinations provide the same overall diameter, so no computer adjustments are necessary. Now if you if want larger tires, like 33-35" vs. OEM 32", then you should consider the effects of more rotational/unsprung weight. For that a modern diesel truck towing an Airstream, I doubt the effects will be noticeable compared to a gasser.
I strongly discourage a front lift kit only. The higher in rear unhitched rake is designed to support the 2200-ish pounds of payload that mostly goes in the truck bed. If you never loaded the truck, go for it. Since you plan to use it like a truck, don't change the stance.
