12 volt TV lifts are becoming common.
http://www.e-motionllc.com/TV_LIFTS_s/25.htm
This would work for lifting a monitor.
Below is a link to one idea for an RV computer desk. While insufficient for my needs, it is certainly an option, and includes some good ideas for dealing with peripherals.
http://www.daviscabinets.com/id72.html