Boy, its been a long time since I repeatedly disassembled/reassembled these, but I found a good picture by searching "Venture Landing Gear" on Google Images.
Here it is:
I am pretty sure that by removing the square bar to the follower leg and its adapter piece, you should have freed the gearbox and motor to slide towards the middle of the rig. I also seem to remember if the shafts get dinged up this can be a miserable experience with hammers, files, and swearing as the shafts won't slide out of the gearbox smoothly like they should. If this is bad enough you might want to consider jacking up the lead (door) leg side of the trailer a bit, put the frame on that side on a jackstand, retract or remove the telescoping leg, and take the whole leg and motor/gear drive out so you can get the whole assembly to a workbench to get it apart.