Greetings from the Florida Panhandle
First off, welcome to the Forums. We're glad to have you with us.
If you do not plan on moving the trailer once it gets to Denver, it would probably be much cheaper to have it moved for you than to buy and set up a tow vehicle for the one time 1200 mile tow. It would involve quite a bit more than simply buying a used vehicle capable of towing the Airstream. You would also be looking at buying and installing a trailer brake controller and a WD hitch system. Then if you were not going to move the trailer again, you would be looking at selling your recently acquired tow vehicle. By the time you did all of that a professional mover would be cheap.
SuEllyn & Brian McCabe
WBCCI #3628 -- AIR #14872 -- TAC #FL-7
2015 FC 25' FB (Lucy) with HAHA
2005 Suburban 2500 Quadrasteer (Olivia) & 2011 Silverado 3500 (Fred) with Outfitter Truck Camper (Ethel)