For an open trailer, a 1/2-ton Chevy with a 5.3L is enough. I get 18mpg unloaded, and 13mpg towing with my '00 Z71 ext. cab (with 200,000 miles). I had no complaints at all, even in the mountains towing the Chevelle to TN.
If you go with an enclosed trailer, then I'd step up to a 3/4 ton. Gas mileage will suffer greatly, so then a diesel may be in order...
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Derek Kiefer, member of Minnesota's Northstar Chevelle Club
69 Malibu Pro-Touring - 69 SS396 3spd - 23 Model T roadster pickup
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