Years ago I bought new tires for our popup trailer from the local tire shop. I noticed the max load rating x 2 tires was a hundred pounds below the weight listed on the trailer manufacturer's plate, never mind all the stuff we had in it. I asked the tire shop owner about that and he said the small difference wouldn't matter; just add an extra 5 psi. That worked well for a year or two when about 2 hours away from the nearest tire store one of those tires blew. When I stopped to put the spare on I noticed the other one was a mess with big patches of missing tread. Pretty even wear, anyway!