Wow terminator I was thinking the same type of project a long time ago but got side tracked. The best way I was able to figure this out was to use 2 linear actuators
with a programmable limit switches. I had all the measurements and the parts list and then one day my laptop fried.. lightning storm not on ups and not backed up.. lost a lot of info. but anyway the 2 actuators would replace the gas springs ( I think that what its called. - make sure your controller has reversing motor control as well.
example set top actuator to open all the way up set the ,limit how far you want the actuator to extend.
do the same with bottom door actuator.
the programmable controller can then be set to 1. work by button inside vehicle and to work by remote keyfob.2. set the order the actuators open and close.
wait unlock signal hatch pop then extend top actuator.
2. after top is extended extend tailgate actuator. close use reverse programming and timer.
http://www.dakotadigital.com/index.cfm/page/ptype=product/product_id=465/prd465.htm
or
http://www.surpluscenter.com/Brands/...5-1577-C-2.axd
you going make me start revisiting this project.
off subject could you send me info about your video switcher unit.