You know there is business without mulch. You don't HAVE to do mulch. And a diesel isn't going to do anything for you, Payload wise. Diesels weigh more. If you are going to do mulch enough, a decent trailer and a 3/4 ton will be sufficient. 4.7, is that a six cylinder or a 318 magnum? The squat has nothing to do with the engine and everything to do with the leaf springs. Air Bags would also solve this problem. Brakes, well that's another issue, but you are clearly trying to eat soup with a fork here. What percentage of your income stems from Mulch/tree operations?