Call me picky on this one, but we Farang can't put our name on a property, (unless it's a Condo), so it's not a bad idea to register a bit of assertion and at least put the car in your own name. After all, you are likely to be paying for the car, insurance, maintenance, fuel etc. AND be the main driver, so why not do what's necessary and have it in your name ?

Al - you say you look for a 4 x 4 ? Are you going to be offroading ? If not, a normal 2 wd pick up will do and a 4 door cabin is a great idea ! The pick up helps you do so many things it's better than a saloon as an only car, maybe ?
There are some good second hand vehicles around and if you buy from a farang, it's easier to find out about it. If you are married, I would have thought a copy of the marriage cert. and your wife's ID would help the Vehicle office put it in your name. Maybe the dealer can get that done for you

if you insist on it being in your name, (as I would).
Good luck.