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Were your condenser fans on steady during the time you took those pressure readings? edit- The fans need to be on if the AC is on. Condenser needs air flow over it, would make it impossible to tell whats going on as far as charging it correctly if the fans were kicking off thus allowing the...

Yes I would try it at 300 and see how it cools. If it is not cooling good enough then maybe it needs to be 325 but I prefer to not stress the system any more than necessary.

I like to charge ac at the hottest time of the day to get the best results. That way you know that you are at a safe pressure on the high side.

You are way too high, especially at 10pm at night. You need to bleed some out before you blow something in the system. I know your afternoon climate is worse than what we usually get in Houston but anyway If I were you I would shoot for a high side max of 325 and actually would prefer to see 300...

Consider buying a vacuum pump and gauges and then you will be all set.

Will driver or passenger be in risk of smacking their head on the side of it? You know sometimes you can hit an uneven dip in the road or off road etc that can make people in the truck get thrown around a bit.