printing directly to printer

is there any app to print directly to a wi fi printer without a network, i work construction and my truck is my office, i recieve e mails with information i need to print on site, my truck has an inverter so i can plug a printer in
i talked to a guy at bestbuy and he told me you could as long as it was an hp e print machine, so I bought one, a HP photosmart 5512, i found out this is not true, i also installed printershare app on my phone it works great when im in my home office with the wireless network,
would it be possible with bluetooth? seems like a simple task yet no one seems to understand why i want to do this

PrinterShare is also supposed to work via Bluetooth, according to its product page. Other than that app, I don't know any others that do the same...

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