Another invaluable bit of kit for a winched rig is a sand anchor. If I were to be driving solo in sand a lot the two things I'd like to carry on board would be an anchor and maxtrax. I'm slowly bringing my cruiser up to more of a solo tourer and those bits of kit are on the list.
I wouldn't worry too much about PSI limits, perhaps start at around 20PSI and work down. You might find depending where you are you only need to lower to 18 or 16 to reduce the risk of a bead if you are getting stuck. As well as mentioned, slow throttle and momentum and if you are winching and the winch is reaching it's limits 2:1, 3:1 even 5:1 are all options with the right gear (and a lot cheaper than a new winch).
I wouldn't worry too much about PSI limits, perhaps start at around 20PSI and work down. You might find depending where you are you only need to lower to 18 or 16 to reduce the risk of a bead if you are getting stuck. As well as mentioned, slow throttle and momentum and if you are winching and the winch is reaching it's limits 2:1, 3:1 even 5:1 are all options with the right gear (and a lot cheaper than a new winch).