I Keep seeing the FTX 90 that have engines and under carriage replacements at less then a thousand hours so I am wondering why the tracks don't hold any better. I figure the engine failure are the Deutz, but the under carriage is really pretty poor durability. Considering dozer and highlifts get 4000 to 7000 hours per under carriage.Wonder how long the steel tracks on the SuperTrak are holding up.