Advice on storing in a backyard.

Looking for advice on prepping an area in our backyard to park our tt. It's 30'. my initial plan was just to do some pavers or gravel around the tires. My wife though is nervous that the area can sometimes get soggy and wants to do gravel over the entire length plus some. She's worried that we'll go to move it and get stuck. I doubt that will happen, but what's the least I can get away with to assure her it'll be Ok?