I recently built a 4-place trailer for my quads. I used a narrowed mobile home axle. Its a heavy duty built trailer, not a backyard hack job. The deck is marine 3/4 ply and the frame is 3x6 c-channel. We haul 4 quads on it (i figure 2500+ lbs with gear and fuel) 7 hours to Florence,Or. at 75 mph...