We have a 78 24ft Argosy, and now a 76 31ft Sovereign
. We pull them with 1/2 ton pickups, I have the Tundra and my husband is a Ford man. His Ford has the bigger engine and I would have to recommend it for the 31ft. All that is up to you and where you intend to travel and how much you travel. Here in Oklahoma, we have few hills and we mostly tow ours down to the lake, about 150 miles. You will have things to work on in any vintage; however, there are trailers out there that have been well taken care of. Keep in mind that plastic gets brittle and things get old, but you will not have $30k to $60k invested to worry about. You can usually fix whatever the kids break (or your husband breaks) and maybe make it better than before. I was nervous about "breaking" my first trailer, but now I know that there is nothing we break that my husband or the RV man can't fix. If you can't find a replacement for the original part, and many are now available, you just update with something better or entirely different. Having your own Airstream is a fun time that you and the kids will remember all the rest of your lives.