A friend is going to move some heavy stuff about 500 mi. Using a rental trailer. His truck and hitch will handle the 3-ton load plus trailer weight ok I'm sure but I'd like to get some opinions for him on the rental trailer. It is almost exactly like the standard U-haul 6' x 12' open trailer, and the specs he got from the rental place match, 2 axles, inertia brakes, ball hitch. Rental company states trailer weight as 1700 lbs; stated max load for trailer is 2700 lbs. I've used the equivalent u-haul trailer to haul a 4500-lb. lathe with no problem, but his trip involves a little more weight. Question: If he drives 55 mph, gently, is he likely to complete the trip with the trailer intact or is he taking a big risk? He figured his actual cargo load in the trailer would be 5600 lbs.