My plan was to put the compressor under the truck on one side, and the tank on the other with a copper line which will also have air capacity, so I can get air from either side of the truck, either off the compressor direct on one side, or the tank on the other. I planned on running the air line to the locker off the tank. I'm not sure how much psi is needed for a locker to engage, but it seems I read somewhere IIRC, you only need 30psi. So if I used the 2 gallon tank and regulated the compressor to 100PSI, then it shouldn't have to work to hard and should work just fine to air tires up to 55psi after an air down to go off-road.