I would say triple . More stability going down the road .YOU don't get the sway if it's set up right and not affected by cross winds so much . CHeck the local laws on brakes . MOst states require brakes on every axle ! 3 axles also takes pot holes better ! AND , it makes the frame more rigid as it suports more of the weight . If you get to much hanging frame it likes to bounce . Just my .02.