Popup tires in Texas Heat (90+)

Ihave always filled my popup tires to max pressure (65psi) 13 inch “ D” rated tires. A week ago we had another blowout, door side of camper, 95+ ambient temp, 65 mph, about 30 miles east of Junction TX, headed west. I talking to a camping buddy of mine, he said that what worked for him in his popup days was lowering his tire pressure in the summer, and raising it in the winter. Now I don’t know what size tires or the load rating of his tires, but he said he would have his at 42 psi in summer, and higher in winter. That goes against everything I have ever read on tire pressure on trailer tires. I have always heard: fill to max psi when cold, of course cold is a relative term when the ambient temp is 85 in the morning when you check and fill the tires! What do you folks think of this strategy?
Edit: my buddy said they were 55 max psi tires and he used 52 psi in winter, 42 psi in summer.