Where to service propane parts?
 

I have the whole setup for swapping to propane but I don't know of the condition of the regulator or the carb. They look nice and clean but I don't want to risk blowing myself or others up. Should I ask the gas company for houses because their truck run on the same setup? Thanks!

I would think they could direct you to a source if they don't do it themselves.

You could call a local business that services forklifts also.

There's not much to them, if it doesn't look like it's been driven over by a cat then it's probably ok. Just make sure you don't forget the propane lock-off... the vacuum(usually) operated device that flows liquid propane only when there is vacuum.