If you diy couple things (i didn't have to do my truck as it's under warr but just replaced the condenser on the kid hauler).
Local stores may only have 134a in leak proof cans they seal off when the tap is removed, your traditional tap needs an adaptor, the one i had was irritating like eco gas cans. While i like the idea needs better execution, maybe there are better ones. Those stunk. The dupont freon only ones i got off amazon were easy to flow out of the can with traditional tap (night and day difference).
1 hour vac leak down test may or may not show a slow leak. It's testing under a vacuum but not pressure. I had to refill twice, my gauge wouldn't move in a couple hours even, it was only after a few months it went hot again that i thought to check the condenser (i had added dye) and saw the leak.
Lots of youtube videos on this, but the leakproof or whatever you call them cans add complexity to making sure you purge the line, it's really easy to get confused as it's another knob to turn, another possible leak point (and the cheap plastic adaptor is that cheap) and closing the tap does not close the adaptor and can. If you buy a typical cheap gauge set off amazon,etc calibrate the gauge, don't over tighten the hoses to the manifold (if your gauge goes to full retard when pulling a vacuum that's likely what you did). When pulling a vac if you want to be sure your lines are clear to the ac valve connects and you're pulling vac there, just remove the hose and push in and make sure it's pulling air at that point (it's noticeable from a change in pitch of the vac pump)
Somewhere in docs will be a recommendation to if you replace the consider to add an oz or so of pag oil.
Anyways no idea on the truck but the kid hauler was easy 30 minutes to flip it out tops and then pull a vac for an hour, wait an hour, then recharge.
Hardest part is the small cans are tough to weigh and that's the correct way, but whatever the truck takes hopefully works out pretty even adding in a bit of loss left in the can and small amount for purging the yellow line when you put a new can on (but the dupont cans went out really easy! i couldn't get those leak cans to flow out for squat without a bit of warming).