We have a 4 horse gn trailer and pull it with a 2001 GMC 2500 diesel. When I bought the trailer the guy told me I should put 65lbs in the truck tires when hauling. Do you guys add extra air when you haul? I am hauling one of my horses almost 5 hours by myself on Saturday and then another 5 to my parents house empty later that day. I have hauled myself before but never such a long trip with this trailer and truck. We just had all of the lights rewired and the brakes redone so all of that is in working order.