I'm ready to outfit my kids with 4 wheelers. The wife has hers, I'm still looking, but the boys are ready. One is 7, weighs in at an average build at 75 lbs. He is the balls out kid. He drives the boat like a bat outta hell and doesn't bother him. The other one is 10 and he's a big kid. A little on the tame side, but tips the scales at 130. What are good rides for these guys? We don't have dunes out here, we have nothing but hills, wooded areas/ coal strip mines and plenty of trails.