I have the Toy Hauler you are getting. I tow with a Chevy 1 ton dually Durmax. I wouldn't go smaller! I've had the 2500 HD diesel on a 38' 5er and it wouldn't stop the trailer very quick. It was a lighter trailer than you have now. The 332 is 1500 lbs. more than what I had before. You'll need ALL your brakes working GOOD, if some one pulls out in front of you. I didn't like sitting on pins and needles watching out for everybody pulling out on me! Just a word of caution.
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2015 Chevy Crew Cab 3500
Duramax/Allison Tran.
2013 Raptor 332 Toy Hauler
TrailAir Tri-Glide
2 Honda ATV's for climbing
mountains & getting muddy.
Traveling Partners: Dozer & Zeus