Enclosed trailer/toy hauler advice

What will you tow it with? 1/2 ton, 3/4 ton or bigger? Gas or diesel?
1996 Dodge Ram 12 valve 2500. It's in good shape. It was a southern truck. Had it for a lot of years. Wish I had bought a dually
Now though. I'm too close to retirement to buy a new truck now lol.