I had Generals on my RAM from the factory. They were 2/3 worn out at 25K and one front tire developed a tread separation the size of a football. 25K later with the MS2's and the tires look good with 9-10/32" tread left.
Spend the money for quality. I am sure someone will come along and tell you your rims are not rated for 80psi!
Weigh your rig loaded and unloaded, use the weight/inflation chart for the new tires and add 5psi to what the chart says.
You will be running about what you do now maybe a touch more.
Get er done!