We have a GMC Jimmy with - I think - the same engine (4.3L) auto trans (3 speed + overdrive) and the towing package. We tow a 2619 and have towed a lot of miles including the Colorado Rockies. We average right at 15 mpg when towing. Your S-10 has a longer wheelbase which is good. I would be comfortable towing one of the 2720 models, but I don't think I'd go a lot bigger than that, maybe a 3023 but I'd have to think long and hard to convince myself that it would be OK. I don't know why TM jumped three feet in there 2720 to 3023 is a big jump. I would not get a 2619 if I had it to do over again - I'd get a 2720 (NOT SD or SL) but then that's personal preference- I'd rather have the Queen bed in the back.
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