As long as you aren't exceeding the load ratings on the tires, the GAWR on the rear axle, or the GVWR or GCVWR of the truck... you should be OK.  Larger rims for a given tire diameter will tend to have tires with lower weight ratings and lower profile tires which improves road performance and braking(larger brakes can be installed inside larger rims) at the expense of tire wear and firmer ride. Such tire and rim combos are more appearance than anything else on a truck(vs a car) in an attempt to "macho" up the truck by giving it a more performance oriented "aura". I am assuming you have a SRW drive truck as that size rim does not come with a dually. In most light duty truck applications such tire/rims do not adversely affect typical light to moderate towing capabilities... within limits.(see opening statement)