I have several floater tires 48"h*31"w ,also some 66"h*54"w , can get some large construction tires , about 20 ,30gal & 55gal. plastic barrels (how will those hold up??), 20+ wood pallets , 20" dia.*12'. tree trunks, 1000-2000yds dirt/clay mix(hill climb??) , can get as much shot rock(very large) as I want , thinking about making some sort of tetter totter out of steel w/expanded metal floor,not sure on dimensions L*W*H . I want to make a nice course , not something that looks like a junk yard as I still have to convince my better half that it will look nice, especially since she will be mowing around it