Losing Rear Tire Pressure on Tow Vehicle
I am towing a Winnebago Micro Minnie travel trailer, dry weight plus load is about 4300 lbs. The tow vehicle is a 2016 Nissan Frontier, crew cab, GVWR 5815 lbs, GVWR FR 3296 lbs, GVWR RR 3331 lbs. Tire inflation for the Nissan Frontier is recommended 35 psi for both front and back tires. I have noticed after a towing trip, both rear tires seem to have lost 2 psi, and I measure 33 psi, the front tires remain unchanged at 35 psi. Is this normal for the tow vehicle rear tires to lose a couple of psi because of towing a travel trailer?