I have a 65 C10 2wd and am looking to swap to a 4wd frame. I found a 1983 K20 suburban donor but unsure of total length of it. The info I found said the wheelbases were almost the same and I know I'll have to fabricate the mounts. What do you think? Also I went to go rent a tractor on a trailer and the guy told me I needed at least a 3/4 ton to pull it (that's why I found the K20). What's the difference between 1/2 and 3/4 and is it really necessary to go bigger? You guys are great! Thanks, Matt.