I was originally going for a 20' box truck. But the plan is now a 16' box truck. This means a fixed bed although still possible does mean a loss of some of my original ideas. I decided to look into lift up beds and have done a few designs using pulleys with either a counterbalance weight, motors or hand cranks ratchet. I have also looked at really long Linear actuators and servos. Motors with rotary encoders and PWM drivers.. It has been fun trying to figure out the best engineered solution to this problem.. Today in my youtube recommended videos list this popped up.. Seems like a good solution apart from not being able to easily hide the mechanics. Anyone have any good ideas/suggestions?