2 questions: how often does the Fox rear shock on my 2000 Indy 500 XP XC need rebuilding, and what is a good indication you need a rebuild? The sled sat for 2 years before I bought it, runs great, has the extra 10 suspension, but last season, I noticed even a small field approch jump felt like it bottomed, I admit, I don't have a lot of ride time on sleds, but I thought the extra 10 would be a litttle more plush than that. Thanks for any tips or advice !! I'm loving the fall so far, but am getting that itch to ride some powder !!