I think I'd have made the same choice. My stock TPI 'vette will fry the tires pretty much anytime I ask. It does flatten out somewhere above 4000, but I rarely use that part of the range, and in a truck I doubt I'd ever use that high end.
1955 1st GMC Suburban | 1954 GMC 250 trailer puller project | 1954 GMC 250 Hydra-Matic | 1954 Chevy 3100 . 1947 Chevy COE | and more... It's true. I really don't do anything but browse the Internet looking for trouble...