What pressures were those? I'll bet he was unhappy if they got aired up to 110 psi! They'd be like riding on Fred Flintstone wheels! 70 or so in front and 60 in the rear unladen is a great plenty. Even with 3500 lbs in the bed, 80 psi is plenty. That'd be good for a rear axle wt. of 7940 lbs per Goodyears 2005 Load/Inflation information. At 90psi, they would support 8190 lbs on the rear. That'd be like 2 1/2 tons in the bed! Also, at 80 psi single on the 265/70R19. 5 size, the rear of the truck is very stable with 3500 lbs in the bed on my '06 SRW 4x4 QC LB. No side sway at all. You do need shocks that work (ie Bilsteins), as these tires in combination with steel wheels are very heavy. They wouldn't miss the wt. of a set of OEM duals by much.