i crumpled my tunnel only a month into having my first pro so i designed a bumper for my own sled to alleviate the problem,it turned better than i excpected, its only 2.8 pounds for the 55 so i decided to produce and sell them....i have a standard height in a 55 or 63 or a pack rack i call it with a tie down system so you can carry much heavier items....i pulled 4 sleds last year without incident,im using 6063 alluminum so there very strong and also keeps the weight down....if anyone is interseted please contact me 307-413-3196 there $225,my tunnel replacement was $3800 due to polaris not honoring the warranty so hopefully this will prevent an expensive fix and a month of riding lost