Thanks for the responses. 100 foot extension! I guess I don't have to worry about a 30 footer then.
And yes, I have considered the issues of setting up a portable system and probable concerns with theft but this setup would primarily be a test run to see if solar is really a benefit to my style of camping. If this panel meets or comes close to my needs a permanent system would almost certainly follow.
Then this portable system could just float between my camper and fifth wheel depending where the extra wattage is needed.