1) has anyone mounted a laptop rig?
Used to be involved LEA laptop installs of a fleet of over 600. There are a lot of products available but you get what you pay for. If you don't get quality units then your laptop is going to wobble, have problems with elbows, mounting points, etc. Also try to get a unit designed for your vehicle, not a universal vehicle mount.
Here are some suggested resources:
http://www.jottodesk.com/Comersus/st...namicIndex.asp
http://www.mobiledesk.com/
http://www.ram-mount.com/?gclid=CK_i...FShGagodIyEHtg
http://www.precisionmounts.com/
2) I would use an inverter to power printer and computer. Will this be too much on the current, stock spec battery?
Best is to run vehicle power adapters for your equipment vs. inverters. I would suggest upgrading your battery if you use the equipment a lot, especially if you're running a wireless connection.