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I'm driving my self crazy with trying to make the right choice for our tow vehicle. I've been interested in 2000 or 2001 Tahoes. Is this overkill for our airstream?
If you are considering a Tahoe/Yukon with the factory heavy duty trailer towing package, you will have a nice margin of comfort with your Caravel
. You will likely be loaded to something in the vicinity of 60% to 65% of the trailer tow rating (again, assuming that the Tahoe/Yukon has the heavy duty factory trailer towing package). What this will mean to you is that you will have better stopping power when towing, and will experience far less wear to the the tow vehicle than if you chose a less-able tow vehicle where you might be within a few hundred pounds of the GCVWR. In addition, the more lightly loaded tow vehicle (relative to its trailer tow capacity) may actually return better fuel economy than the tow vehicle that is loaded at or near its GCVWR - - I know that was the case when comparing my K1500 Z71 (5.7 Liter) Chevrolet pickup with my current K2500 Suburban (7400 VORTEC) - - the Suburban actually averages close to 2 MPG better than the Chevrolet did when it was loaded to very near its maximum GCVWR. The only thing that you might notice is that with a 4WD version of the Tahoe/Yukon you will need a deep-drop draw bar to get the correct hitch height with your Caravel
. Another benefit of going with the Tahoe/Yukon is that if the Vintage "bug" bites again, you would be able to consider a "slightly" larger trailer and still be within the comfortable capacity of your tow vehicle. It is rare to hear of anyone being unhappy because they have "too-much" tow vehicle, but there are many threads regarding experiences with "marginal" tow vehicles.
Would a Trailblazer get the job done?
A Trailblazer MAY be able to handle the job if it has the factory heavy duty trailer tow package. Your Caravel when fully loaded should still be slightly to somewhat below the maximum trailer tow rating for the Trailblazer with the factory heavy duty trailer towing package, but you would have far less reserve margin than with the Tahoe/Yukon series. Also, since you indicate plans to keep the tow vehicle for a long period of time; you might find yourself locked in to a too-small tow vehicle if you should decide to upgrade to a slightly larger trailer in the not so distant future - - or another Airstream or Agrosy might find you and start you on a collection.
This is one of those areas where personal driving styles and expectations play an important role - - my preference is to be able to maintain 55 MPH when towing on major highways, and especially through the Eisenhower tunnel on I-70 - - if my tow vehicle cannot manage this its performance is not up to my expectations (the very reason that I traded my K1500 pickup - - it was down to 20 MPH in low gear and I didn't think that it was going to make it towing the Overlander which was within about 200 pounds of GCVWR). Someone who doesn't feel uncomfortable when their tow vehicle is just barely able to make the grade may have considered my K1500 pickup acceptable, but I didn't.
Good luck with your tow vehicle decision!