I'm a driver and there is nothing I love more than to be out on the road in my motorhome. But having said that, there is very little chance I'd plan a cross-county and back trip to be done in two weeks. I once went from California to Oshkosh Wisconsin and back and we did that in two weeks. But even then we left California on a Thursday after work and pulled into Oshkosh on Sunday around noon doing nothing but driving and sleeping all the way. We went to the airshow for a few days and then over the next week and a couple of days worked our way back to California through South Dakota and Wyoming.
If I wanted to go coast to coast and actually see things along the way, I wouldn't do it unless I had at least four weeks, probably more. If I only had two weeks and I wanted to actually stop and see things, versus seeing things out of the front windshield, I probably would stay within 1000 miles of my start point. Probably make a big circle.