Timbersled skid
If I was doing it from scratch again, I would go with non-tipped ice age rails predrilled for the timbersled. It would save your stock skid so that it can be easily put back in. Its also a quicker swap than cutting your stock rails. The tip-up sucks for a boosted sled, can you say wheelie machine. For the little but of "push" on trails, it is worth the flat rails. I pressed my stock rails flat when I installed my timbersled and it holds the front down much better than stock, about 500 miles and they have not bent. Note that I did not try the timber with the tipped up rails. JMHO