Sorry, but I have to point out that at positively no time is it recommended, or safe, to use ratcheting nylon tie down straps to secure a tractor to a trailer. I'll let you look it up on your own, but as most every person here will tell you, even a tractor the size of a ck30 most definitely can break two perfect condition straps like you suggested, and drop the tractor off the back as you drive down the highway.
Please don't take it as rude, but I felt obligated to point out that the tie down advice you gave is wrong and dangerous. Again, do some searching here and you will see exactly why. The DOT officer in my state specified 4 (one on each corner) grade 70 chains for a rolling load. Ratcheting nylon straps are for securing non-rolling loads only. Just so you know, two straps that were less than a month old, identical to what you suggested, broke on the front of my tractor while driving down the highway after going over a dip in the road. I thought I was safe with two on the front and two on the rear. I was wrong, and dangerous. No, no sharp edges, no fraying, no issues. Plain and simple, they will not properly secure a tractor.