B'Ham Jeeper,
Sorry to hear about your long lost weekend---I know, when your back hurts you hurt all over. If there is a serious problem riding in a Jeep will not help. There are lots of different rides out there. My last road car as a manufactures rep. was a LS-400---(a fast cloud), then a Toyota Tundra for trailer pulling and house building---(a rough 6 speed stick wagon), and now a Jeep Liberty---a tough, better than a pickup ride, versitle little beast that is fun, except when you are trying to get your big hand and arm way up in there to remove the oil filter. There is a Jeep engineer somewhere that should be shot.
Where in Mexico? Look on your map about 35 miles south of the Guatalajara airport to the North shore of Lake Chapala. There are some 40,000 expats---snow birds and sun birds from the US, retired military, Canadians that have frozen out, and a few Dutch, French, German, etc. just to make things interesting---and lots of Jeeps. Most Mexican roads are a brutal test for anything with wheels, or legs for that matter---and yes, hard on your body.
Easy does it on the back, and learn to lift correctly. I do exercises to over compensate, and have not had a problem in years, but you must start small and slowly build up.
All the best,
Don Lott