Personal opinion: The topic was started as "Who makes the best sand car?" so I'll take a different approach...I believe sand cars should only have about 20 or so inches of travel. Too much travel will absorb a lot of the bumps but will not get you any speed as you want the car to be in harmony with the undulations of the terrain. The car should also have enough "beef" to it as we know stuff happens but not so over built that it's a floating turd. Safety is pinnacle. Whole other topic but harnesses not straps, ability to wear a helmet in the car, visibility, comfortable, etc. The other very important thing is for the car to have the right geometry. With regular dirt tires it should drive as sound as your daily driver, not all out of control. This is a BIG issue with many cars as many will say "It's an off-road car" so it should have a different set of parameters...funny. It should be absolutely sound and in control all the time (maybe a little loose as a fast car is a loose car). Finally the discussion of power. It should have a good power to weight ratio so that you can power out of things. We usually devote power to speed but there is a lot to say about muscling through an unexpected obstacle. Peace.