Hi Dan,
I've followed your blog and see how you use your trailer. My bet is, that for the money, you'll be way ahead in the long run to keep that trailer, and rebuild as needed in the coming years. It's small and simple construction will make it easily repairable.
My personal take is that it's a myth that trailers of this design and construction are short lived. The key is in proper maintenance and repair. In my travels I see many, many trailers of this type of construction in the 20 to 30 year old range that are still serviceable. The interiors may be dated in style, but that is easy enough to upgrade.
If you like your floorplan, keep it, use it, fix and repair as needed. Spend the money that a new trailer would cost on travel so we can see more of your fabulous pictures.
PS. I know in my case, by the time I will be able to wear out my Funfinder, I myself will be dead from old age !
