Detox,
I posted a reply but not sure why it isn't showing up.
Anyway - The plate is 18" wide (side that attaches to transom) and 12" deep.
You should not need an auto retract feature if the plate does not interfere with your trailer. The one I installed on a previous boat was fine on the trailer even when all the way down.
If you think you need one iMarine sells a Bennet box for f$55. See link below.
http://www.imarineusa.com/bennettaut...r12var512.aspx
The switch I am using will be the Lenco model listed above. It is a momentary SPDT.
Here is a great install thread on the MB Sports Owners Forum:
http://www.mbboatowners.com/index.ph...?hl=shawndoggy
PM me when you are ready to pull the trigger.
Scot Carper