A friend just blew a tire going to onidea lake at 65-70 mph. It ripped of the fender, tail lite,brake line & did gel coat damage. He only had 40# of air in the tires. The trie dealer told him they should be at 50#'s. Guys load boats up with Equip, coolers, & other odds & ends ,all add up in weight. Low air creates lots of heat. Easier & cheaper to add air buy 6 plys