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Thanks for the replies guys! Sure makes pulling a sled easier, more fun designing and building though. Skifisher I used 1/4 thick aluminum flat bar 2 cross pieces front and rear 4 total. It holds around 200lbs of gear used it last winter with the 2 inch risers no issues except it sat too low. ActiveTrapchecker 10inch riser seem a bit much and possibly top heavy, I don't have much experience building smitty sleds go with what has been working might just shave off some of what you already have.
5inch long 1/4 inch countersink bolts with metal nylon lock nuts. Used a cut off wheel to cut the access bolt off then grinded it smooth. It’s bolted from bottom of the ski to the jet sled through the risers and cross bars. I forgot how long the cross bars are but they are the width of the outside runners for a jet sled XL. So close to the width of the jet sled xl