We use road rails at our track as well. I find I have far less broken parts & repairs using these. As for people jumping them..... It happens in real racing too. Just ask Alex Zinardi!!!! We used to make our turns with them but it was too problematic & now use domes for the turns. As for the outer wall we have found an awsome material that is baisicly a plastic 2 X 6. It is divided into 3 2" sections internally. Connecting them is done with 2" PVC pipe in 6" lengths. We glued them on one side & inserted 3" to make them integral to the 2x6. Each 2x6 has 2 pieces on one end (top & bottom) and 1 piece on the other end (middle) to make a conncetion that looks like this -= at the junction. These boards are then backed with tubular sand bags to keep them from moving when hit. No one
in our entire group bent a stinger hitting this during the entire season. If you hit directly where a sandbag was backing it you could collapse a camber arm but that is all.
TM, Murnan, RB, Morgan, Nomadio, GQ, Integy, GP, Duratrax, Protoform, Cruisin, Raceday, Wolf