Call general. Most companies are more than willing to help you get your vx setup properly. If you get your tires s at the right pressure they will last you longer and you will buy again.

You should be nowhere close to 80psi. You guys telling him otherwise are dead wrong.

Your tire pressure is a function of load range, contact patch and vehicle weight. Over inflating your tires will help gas mileage some, but at the cost of traction and teeadwear. There is an ideal range that maximizes youre contact patch and keeps the sidewall from bulging. This is what you should find by doing the chalk test and visual inspection. My 285/60/18s have a load range of 116. I got a chart from the manufacturer with the tires load capacities at different psi and found one that was 1/4 of the vx loaded weight (i estimated about 5k total lbs for towing and hauling cargo). My pressure shoyld be around 28 psi based on that chart.obviously this seems low and I wsnt crazy about it but calculations dont lie.

I put my tires at 28 and they looked good and rode well. I eventually chalk tested higher and higher psi until I found a sweet spot of pressure and wear. It was around 36 psi.