I read in some pass post that the SZ 60" diesel does not have much for a trimming edge. However, the specs. on the diesel has 6" trim for the 60" and 8" for the 72". Is this not the same trim as the Super Z 60 and 72 inch? Why is the trim not more on the SZ if it has narrower wheel base. Also, please explain to me how the tire-to-tire width can be 62" when the over-all width is 62". Seems to me 62"(tire-to-tire) and 6'(trim) would be 68" (over all). Maybe my thinking is all missed up. Please straighten me out.