Owen 99 3500 w/355 auto. Just returned from 3 months in Alaska and truck worked great with 11'3" Lance truck camper. Came home to order 04 ho 6sp and NY will not permit the order. Now I bought a 32' 5th that weighs 10,000. I have 55M miles on present truck. Gauges, Double deep, and Exhaust brake . I am thinking about 275's or a box along with maybe a ATS Auto up grade. What are your throughts on the subjects? I think that without transmission upgrade maybe anything bigger than 275's might not be the best for that auto. Thanks Rob