6/14/2017 Update:

My original attachment system for the removeable legs didn’t work very well when I tried to remove the legs, the wood shrunk and the legs were very difficult to remove, and the wood cracked.

Here is my new attachment.

PVC Plug 1 1/2 in (SKU 449-015)

I drilled a hole in the top and attached with a 1 1/2 lag bolt and washer.

I’ve been asked for pictures with the mattress in the car:

We recently purchased the LUCID 5 Inch Gel Memory Foam Mattress – http://amzn.to/2wEiegx