Does your truck still have 8 lug wheels? You need less back spacing to move the tire out but don't know if 3/4 ton spacers are available or if 8 lug wheels with different back spacing are available. Stack washers on the lugs till the tire clears and then measure washers to see how much is needed. A machine shop could make a spacer and you can buy lugs in a longer length. The truck was designed with all the suspension and hub components to operate with the truck fully loaded so the little bit of extra stress put on it by off setting the wheels is miniscule in comparison. Unless of course your are also going to have it fully loaded.
