If you could get one for a deal, I would. The vast majority of components are common to other trailers, or things that are fixable by a competent dealer. Personally, I'm not particularly worried and plan to keep using my trailer for some years yet.
Exceptions:
Bunk ends (but after they're more than 5-6 years old, the designs have changed and the manufacturers are often hard pressed to supply parts for the old designs whether they're still in business or not).
Things like molded propane tank covers, plastic wheel well molding (mine doesn't have either of these). Those would be pretty hard/impossible to find.
