Just to reiterate what has been said, air up to max psi. A 1/2 ton needs every bit of control it can get pulling an RV. Your profile shows an Equalizer hitch so you have a good hitch - just set it up right.
It appears your tires are "SL", or standard load, tires. Here is a description of what that means;
"A classification of SL means it's a standard load tire. Most passenger tires are standard load, but standard load tires can also be used on some lighter trucks and SUVs. If your vehicle came with SL tires as it's original equipment, then SL tires are a suitable replacement."
Note that it says "most passenger tires are SL" and SOME "lighter trucks". Reading between the lines it basically says to me that you have passenger car tires on there with an AT tread. If it were me I would run at max PSI when towing until I put a new set of heavier tires on the truck.....by the end of the week.
