Instead of carrying a spare tire I'm wanting to carry an inner tube to put inside of my tire if I was unable to plug it. I have 44" TSL's on 16.5 inch wheels. Can anyone tell me where I might find a tube that size and what size I should look for. The numbers I was finding for Tractor tubes made no sense to me. Has anyone else done this, and if so what size tube did they use and where did they find it?