Do a search on "mobile mesonet"
Simply search for mobile mesonet.
Davis Weather Instruments seem to be a favorite for most people. It's reliable, easily converted and reasonably priced for different systems.
The same goes for Oregon Scientific Instruments. They are somewhat lower in price, but I haven't heard much bad about them. Just a little different in how the data comes through.
At the upper end of the spectrum are the RM Young Scientific INstruments. These are the types that NOAA used on their MM and we see on the Oklahoma Mesonet Stations dotting the landscape. Very accurate, and very, very expensive.
Another company comes to mind is PEET Bros. They seem to have an actracively priced weather station, but I don't know anything about them. There's another company out there that does some custom stuff and is at the higher end of the "consumer grade" equipment, but I can't think of their name right now.
As far as putting one together, there are lots of ways to do it. Wireless seems to be about the best way so you tear up your vehicle stringing wires around. Since I have a fairly beat up pickup and I'm not too worried about how silly it looks, I went with a cabled Davis Weather Monitor II. I believe there may be a wireless version of this, but you will pay more for it.
NOw that all that is aside. be sure you know what to do with all that data. Just putting up for the "Hey look at me, I'm a weather geek" thing is pretty much wasting your time and money. I went for a long time on just FM Radio and NOAA Radio plus the knowledge I gathered in forecasting. That's where the real stuff comes in. I love to see how well my forecasts pan out against everyone here. The biggest reasons I got the MM was the fact that I've started reporting my information to the public. I wanted to give them accurate information and my guessing at wind speeds, hail sizes, etc... just wasn't doing it. I will also report to NWSFO OUN when I find myself in a position to do so. I know we had some pretty stiff winds not too long ago and their mesonet station was showing 45 mph where I was 5 miles south of it showing 61 mph. No one else was around that I could see. Being the fact it was 3:30 a.m. probably had something to do with that.
Good luck and I hope that helped some.
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