If you are capable of doing all that heavy work, why not just carry tire changing tools. Break down the tire, beat the new on, air it up, and you are on your way! Just kidding. Those tires are heavy, and when mounted on a rim it takes two old men to handle them. I have seen times when the only thing that could break the lug nuts was a large impact wrench, and lots of air. Your going to invest a lot of money getting set up for this. Large bottle jack, lumber to go under the jack, tire carrier, lug wrench, Cheeter bar, socket with break over wrench, extension, torque wrench multiplier, and a lot of sweat. And then the cost of the rim, and tire.
You could go to your local truck tire shop, talk to the shop Forman. Explain to him what you want to do. He will answer all your questions. You could probably save some money going to a local welding shop(certified) to have a rear tire mount made.