When I visited Williams Soaring.. Two gliders were delivered in a container.. They were in a trailer secured in a container.

I don't know why you think the suspension of the trailer would be compromised. They should tie down/chain down the TRAILER, not the box. Many rigs now have 'air ride' and are pretty smooth. You don't need a open sided flatbed, the trailer would fit right in a standard box I believe.

I helped unload the gliders from the containers while they were still up on the carriers. It involved a few helpers, and a forklift to get the trailers out, and DOWN safely. I'd recommend contacting Rex out there and having a 5 minute conversation about the do's and don'ts of how to get a trailer out and down. I think a standard loading ramp would be too steep of an angle to go down, with nothing able to hitch to the trailer to hold it as you rolled the glider out. If you found a very flat loading ramp for the trailer to back to, you could maybe use a block and tackle to help pay the trailer out.

Good Luck.
JP