I just installed the progressive industries hard-wired 30amp surge protector on my trailer. It took about four hours and was a ton of fun! It was a little hard getting those stiff wires maneuvered in such a small space though.
I installed the remote read-out on the wall in the main space, but down low so it's not an abnoxious distraction.
The only thing I would have done differently is mounted the main box about 1 foot over so that in the future it will be more accessible. Hopefully though I'll never have to access it again!