Hi Jamie,
There are a few other threads up in the A Place to Talk Technology category about printers and a few specifically about having them mobile in a car.
This post is probably the closest to your exact scenario and should help a little about getting everything set up.
If you’re just specifically looking for a good printer/scanner combo there are lots of threads about that but this one and this one are two of the most active and recent.
Hope I could help,
James - Notary Cafe Support