We have had our 2012 MPG 181 since fall of 2011 and have taken two 6 week trips to Canada.Other than a few small problems on our first trip it has been smooth sailing. One problem that has not resolved itself is the mattress - its fine for the first two weeks but even with a topper ( second trip) it becomes too uncomfortable. Has anyone else replaced the mattress and do they have recommendations.This is our second post - the first one from last week disappeared.Hope this one is posted.We have been lurkers on this site for years and were disappointed to have our first post rejected.