Jay,
The Pro Mig is a decent little 110 volt welder. It should be fine for repairing these old trucks. Machine and tank at $250 is a great price. The tank alone to purchase will run you upwards of $180 these days.
When you look the machine over, take a look at the gun primarily where it plugs into the machine. As long at the lead insulation is intact it should be fine. Keep in mind if the machine is not used often, the wire could have some heavy rust due to moisture in most shops. If you buy it, replace the wire if it indeed has any rust. Rust is the worst enemy for gun liners. The machine is probably about 6-8 years old but consumable parts are plenty easy to find. Most Home Depots and Lowes have tips and nozzles in stock.
On the tank, the last test date could mean that you have to pay a retest fee when you have it refilled. The last test date if it has a star beside it will be ten years from that date to expiration. If it is out of date, that will cost you about $25-40 extra depending on the company you use to refill.
At any rate, sounds like a good first welder!
