I have a trailer for my racing sailboat. The boat only weighs 515 lbs. and the trailer weighs at most 500 lbs. (total 1015 lbs.) The tires are 5.30x12, load range C rated for a max load of 1045 lbs. at 80 psi. I know that with trailer tires you are supposed to run the psi on the tire, but because the tires are only carrying about half their rated load would it be OK to run a little less pressure for a little softer ride? They seem pretty hard at 80 psi.