Let me understand your post.
So you use an extension cord between the power post and the Surge Guard? Plug the Surge Guard into the power cord inside the cord storage area, then lock the Surge Guard into the cord storage area?
How long an extension cord do you need?
Does the use of the extension cord compromise the Surge Guard protector?
I do believe that you are right on. The cord in the storage compartment is approx. 25 feet long. Standard 30 amp rv cord supplied by the trailer company. It stays in the compartment. I plug the Surge Guard into one end of the rv cord [the other end isn't movable] and the other end of the Surge Guard to my extra 30amp cord. The entire Surge Guard fits inside the storage compartment. What comes out from the RV looks like nothing more than a standard RV cord. No indication that an expensive Surge Guard is in there also. Any extra length of cord just lays on the ground.
I bought my extra 30 amp cord at Walmart for 45.00 or less. It is 25 feet also.
No, I don't believe being 25 feet from the power source effects operation in any way. All the light
indicators work just fine.
When you first plug in the Surge Guard there is no power passing through for approx. two minutes while it does it's electronic checking. When it verifies all okay, the power comes on. There are lights
on the unit showing you it's status. I should say I don't stuff it in the storage compartment until it verifies all is well. From then on it will shut down if something bad happens.
This year I have seen these units pluged in with no locks, just laying on the ground, and covered with a canvas sleeve to somewhat hide it. I don't know of one being taken, but it is too expensive for me to take a chance.
Good luck with whatever you decide.