Hello, I agree with the double back doors, and the e-track on the sides.I have three rows of e-track on mine, so I can secure it across the top, middle, and bottom. The reason is some smaller pianos are hard to secure on top, and across the middle, because the music desk won't lay back. I use two 8' steel c-channel rails, instead of a ramp. With these the dolly wheels follow the track right up or down, so you can push or pull, and not worry about where the wheels are on the ramp. Also they're a lot easier for me to carry than the ramp. I have two holes drilled on the floor at the back of the trailer, the correct width of the dolly wheels, and I insert pins in the holes to secure the rails to the trailer. Don Valley turned me on to the rails, and they're a lot better for me than ramps when you get used to them, and a lot safer I think. I got the local metal fab. buisness to cut the rails, and weld the correct angle on the ends.I had a fabricator cut a slot the width of the dolly +, in the middle of my trailer, and attach a piece on the door that covers it when closed.This is great when you have a grand piano on a skid board, coming down into the trailer at a very steep angle, so height won't be an issue getting into the door. Best, Hazen Bannister
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