GY told me they don't make a tire that will work. They could not say why their inflation chart shows 95 and 110lbs of air pressure. I believe my trailer has a GVWR of 15K with over 2500 lbs of that being cargo capacity. I am going to order the Sailuns an have them mounted by Discount Tire. I will have to install them because there is no way I can maneuver my rig thru their parking lot. I think I will do 2 at a time and actually only have one tire jacked up at a time. I will use the spare to keep 3 wheels on the ground at a time....not sure if I NEED to do that but I feel more comfortable having only one at a time jacked up.