Here's one for you. Most miles I've heard of...
A couple pulls in beside us with an older Arctic Fox. Got talking with the guy and he said they over 180,000 miles! I thought... YA, right. His wife saw me give a sign of disbelieve and brought out her "trailer diary" that had every place they've been with trailer by date and miles. Miles do add up when you visit your kids, one in VA and another in South Carolina and visit them twice a year and you life on west coast. Can't remember the year model but our 29 1/2 foot (25W 2012 year model) was couple hundred pounds lighter in sticker weight than their 26 foot. More plastic in mine I guess and makes it lighter, I assume?
The only problem was a little spot below tail light that had some delamination. And a dealer did a lousy job...that caused the problem.
Also on third set axles, second hitch couple, 2nd or 3rd skylight, multiple sets tires (and they had 15 inch ST tires) and a tire blow out also took out propane pipe and wheel liner. Nice looking trailer for the age. I think late 80 or early 90's?