We had a 3/4" air impact we used on those, but I have also seen semi guys use a 1" impact. Are you planning on carrying a breaker bar to go with it? I'm thinking a 3/4 breaker bar is probably the most cost effective (Harbor Freight, etc.) along with a cheater pipe that can double for a hand held security system in a pinch. If you really can't decide on the socket, get the 1" and a reducer to 3/4", that covers all possibilities.
Are you planning on carrying a mounted spare, or just relying on a tire service? Even if you are going to use a service to change the tires and don't want to carry a full mounted spare, consider at least a spare tire tire without a wheel as a minimum. If you are counting on the tire service to supply the new tire they can be very pricey and you are stuck with whatever brand and tread they have in stock. I know a lot of RV types carry a loose matching spare at least that way when the road service has to come you are still going to have matching tires on the truck. I don't know what your outside storage is like, but maybe a cable winch like they use on the chevy pickups could be adapted to crank it up underneath ahead of the rear bumper. Just thinking out loud.
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