Sorry about the delay. Overtime and cold meds fog??.
Opening note: I've been having problems with the Yukon - finally tracked it to the MAF/IAT sensor, which might also explain the crappy mpg- I took the time to check actual mileage on my worst trip, which turned out to be 5mpg over the rolling hills of southern Iowa. $200 in fuel for 240 miles towing plus about 60 miles of unhooked sidetrips. Ouch. That kind of mileage kills thoughts of trips to Colorado or the like.
Budget wise: we spent $4k for the Silverado - ran great, 160k, a bit of rust and in need of brake lines, but it had the trailer package, air bags, set up for 5th wheel (still in bed) or class IV. Unfortunately we discovered while changing the lines that someone had undercoated over rust and cracks on the frame. Too bad, ran great. We bought the Yukon for $3500 hoping it will last till the covid overpricing comes back down. As is common the DIC on the panel just strobes through languages, giving only the occaisional glimpse at the odometer.
New or nearly new would be nice from the standpoint of hopefully no repairs for awhile, but budget limits when the Impala is paid off would likely be $25000 or less. Used but good (older) I'd love to keep under $6000 but at least right now that looks more like $10k - only bright side is insurance and registration is less.
I kinda prefer smaller, partly because it fits better in the garage, partly just preference. I'm sure a V8 Dakota or Colorado would do the job but can the I6 in the Colorado or Trailblazer? I've had two Blazers with the 5000 lb towing, but how well can they stop or control the trailer in an emergency? These are the kinds of things I'd like to learn.
If a full size ends up making more sense, which powertrains are good, what problems are known to avoid? Another question, I sometimes see older 3/4 and 1 tons in apparently good shape - if mileage is not hugely different would one be more robust/reliable and so worth the money or just overkill?