You def. want different scale trucks there to test as you build! I made that mistake last week lol. I was building a course out of clay, sand, rocks and wood...I had my Honcho in the pickup but didnt think about testing anything out. I built the course big and bad...and then I got off the bobcat and thought...Oh Shhh! We have a hell of a time crawling the hills b/c the angles and height are too much. Naturally the comp. rigs will do it easy, but scalers have a hard time...I ended up breaking my honcho trying to climb some of my stuff lol. The course may look small when you're done, but even the smaller obstacles can be a blast!