Hard decision...that's the same boat we were in. Even our mileage, ours is 73,500 in a 2001. Everybody's different but we decided to keep the old thing. We already paid tax on it when we bought it and resale value not that good and didn't want to pay tax again. Tax doesn't sound like much till you add it up. But YES!!! We would like the new 27 5L. They are sweet...But don't want to spend the money.
Looked and looked and found a 2013 25W Arctic Fox (TT) that was used maybe 4 times by a couple that trades them in every 2 years. Here is the posting, you can see the weights if interested.
https://www.rv.net/forum/index.cfm/fuseaction/thread/tid/28110287.cfmOur truck should have a lot more miles left in her.
(I would say other great things about her but won't being I spent the day messing with the anti-rattle clips on the brakes pads :)