Before even taking your vehicle out of the driveway, you should check it for general functions. Make sure you have plenty of gas, check the oil, check the air pressure in the tires and ensure you have jumper cables, flares, tools, and a first aid kit. Also, it is smart if you prepare for the worst-case scenario. For air pump for car tires you might get stranded for whatever reason so you should have enough camping provisions to last you a day or two just in case.
Please read the originial post here: https://www.adeptcreation.com/what-is-the-best-tire-pressure-for-off-roading/