[Winegrower]

Your short list looks good.  I did notice you included a Lexus GX470.  I don't know if it is towable 4 down.  We have a GX460, basicly the same, but it is not towable 4 down.  And although advertised as an off road capable vehicle with the KDSS suspension only the rear suspension can be raised and ground clearance isn't that great especially considering approach and departure angles with all that plastic hanging on front and back.
At Newell earlier this fall there was a couple towing one of the new Jeep Gladiators.  Long wheelbase and a pickup bed to boot.  Toyota's Tacoma and the older Land Cruisers fit that bill too and have been available for years.  Although I admit the old Land Cruisers have been compared to buckboards as far as ride quality.
Having lived year round in Middle Park Colorado at 8K ft where we had 2 seasons, 4th of July and Winter, I recall the importance of protecting the vehicle against freezing. A vehicle left outside will have gelatin for oil and most everyone used a block heater to protect the engine.  Then there's the battery to consider, along with the critters who may decide to eat your wiring in that nice warm environment you've created to heat your engine.
Have fun with your search.  Looks like a Christmas present may be waiting under the tree.