Definitely drop your tire pressure. Most folks run 15-21 psi, so try 20 and see how it feels. Limit your speeds and don't turn sharp when running lower pressure. Test the tire pressure drop in your own driveway so you'll know what to expect. Obviously air back up before taking the truck out on the road.
I'm making an assumption on where you'll be driving but there are only so many options in this state.
For IBSP, try to stick to using the Fisherman's Walkway entrance just south of the bathing beaches as the sand isn't as bad as it is at the end of the road (Area 21). Make sure you have all the required gear just in case something goes south.
If you do get stuck, don't make folks unload their own gear to help you. It's easier to get assistance if you've got your own shovel and tow straps out and are actively attempting to get yourself unstuck. Have your partner hold the strap and flag down assistance while you're digging. Be patient and friendly.
Happy fishing!