The weight of the equipment multiplies manyfold when you hit a pothole and the weight is slammed downward. The weight absolutely has to be able to be absorbed without going thru the floor, which is what some people just don't understand. Over engineered floor capacity is what it takes, not weight saving, cost saving methods that spread the cross members apart and decreases the floor surface capacity. A lot of trailers built "on the cheap" have floor supports up to four feet apart. (YIKES). Some of the better ones are a lot closer, but even that isn't all it takes, because if the spacing is good, but the capacity of the crossmember is too low, it doesn't help. If you have a trailer that is suspect in floor spacing capacity, as was previously mentioned, put in a board to spread the weight to mulitple crossmembers and maybe even the frame rails.
David from jax