[bsmith0404]

John's explanation is long, but IMO he hits the point very well. The tall sidewall on P tires creates a lot of flex under load so people recommend LT tires with a stiffer sidewall for better control and stability. With a 55 series tires, much of the flex is eliminated. As CW pointed out, there is more than enough load capacity with the tires you are looking at especially considering that with a properly adjusted WDH, the majority, probably around 55% of your loaded weight will be on the front axle which will leave around 3,500 lbs on your rear tires.