Thanks Dave. The tank size can always be off; there's just no way to tell for sure. As for the Magee and Loogootee rigs, if those serial #'s match the years, you're most likely right.
The Princeton rig is registered and titled as a 1974, but all ID'ing marks/plates are long gone, so there's no way to tell for sure. It's been so heavily rebuilt, that there are probably no visual clues left on it to try and match it up with another pic. I'm wanting to get in contact w/ Mr McGinley anyway about some background info on his company, so maybe he can tell me for sure.
The Princeton rig is registered and titled as a 1974, but all ID'ing marks/plates are long gone, so there's no way to tell for sure. It's been so heavily rebuilt, that there are probably no visual clues left on it to try and match it up with another pic. I'm wanting to get in contact w/ Mr McGinley anyway about some background info on his company, so maybe he can tell me for sure.