I already have for a power SSQA.
http://www.tractorbynet.com/forums/customization/321704-linear-actuator-power-ssqa.html
V1 uses those cheap $60 ones rated to about 200lbs. V2 used a $150 one rated to 500lbs or so. If I ever do a V3 for another tractor I would use the cheap ones again.
I've also used those cheap ones for some chicken coop doors.
I wouldn't use the cheap ones for the forks. To slow & wimpy. The 500lbs ones might work though. You could even side shift as you ran the 2 switches in the right direction.