First get a weigh in and determine what the weight is on each tire. Pull just the trailer on with each axle on a different plate. The. Pull back on with each axle on a different plate but one side off the scale. With a little math you can figure out the individual weights. That eliminates loading as an issue. Next would be allignment. You can go to a trailer/semi service center as they are the only ones equipped to do this correctly. I would also have them add greasable shackles in lieu of the stock ones that will fail! No sense in paying for an alignment twice. Tires, i would stick with be goodyears. In this area you're still gettn what you pay for. Good luck
