Thanks Aggie
The counter extension i did is basically I stuck a round peg into a square hole:)
I used 1/2 solid steel rod attached to extension
and a square tube receiver attached to main counter.
For my doors on the trailer, I used 2 inner layers for the door to seal against.
First layer was 1/8 inch plywood second layer is 1/2 inch plywood.
The 1/8 inch allows space for neoprene seals to sit flat when door is closed.
Door locks are 1 inch diameter cylinder locks no pictures of the locks but i will take some.