Good luck to you. You ought to be able to reason with the Mrs...
Search for the deals of Airstreams the dealers have had on their lots for longer than they would like or gently used Airstreams. They are lower to the ground but there is a skid plate to help protect the undercarriage. We have experienced hitting bottom between a steep drive and street. While I wasn't happy and the road had many scars from others as well we suffered no damage. When we had a TowLite trailer we added a lift kit for clearance but we haven't had any problems with the lower Airstream, but I wouldn't want to take it where there might be problems. Now the front of the Burb is so much lower too. Oh well. Offroading or rock docking wasn't really for us anyway.