Most use PVC pipe- 2". If you have someone that is a plummer so you can get it a wholesale prices that's better. You'll also need a blower, for traction the easiest thing is Grape or Orange cheap soda. Just put a hole in the top and spray it on the track surface. Or get a sprayer and apply it that way. For disk- if you know a farmer get some worn out plow disk.
Most important thing is where are you going to park your trailer during the week?
Team Epic/Trinity -Michael Bruce Hobbies-Team CRC ,Kimbrough Products GForce and RJSpeed.
WGT-R, GT Racing USA (17.5 foam),RJSpeed- Legends &Spec Mod, MudBoss and 386 RaceWay.