Idaho,
The only thing you need to watch out for is what the battery voltage was set up for in the UPS. A lot seem to be 12V, but that isn't always a given, especially if the UPS is a bigger one. But if its 12V, you should be able to wire it into your pickup just fine.
Even better, if your PU has a two battery setup for a camper...then if you get carried away with the sawzall and run your battery down you still have the other battery to start the truck!!
A lot of folks don't realize how much juice a UPS can pull...for example, an innocent little sawzall pulls maybe 3 amps at 120volts. That translates into a 12V battery having to provide 30amps to run that puppy.
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