Our '04 Land Yacht 30 had 18,000 on her when we brought her home to PA from NC. The brakes during the first couple hundred miles were exactly how you stated, and I'll even add, "scary"! But she was sitting for near two years, so I believe the rotors were all kinds of dirty. By the time we got her home, brake pressure improved, but it's still not your Dad's Oldsmobile
Has the '02 you're considering been sitting for awhile? Were you able to put 20 - 30 miles or more on her? Are you able to have the rig checked-out by a professional?
Sorry I can't be more helpful.....
Best of luck,
Randy