Get a Petsafe Wireless fence!!!!!
All the exclamation marks are because I found it to work so well I couldn't believe more people aren't talking about them for campers.
But... you do need electricity. Which is usually not a problem for RV's
You can get them between $150 and $250 - money well spent when you consider the restricted run areas of pens, the tangles of tie-ups, and the pain in the butt of put-up/take-down of other confinement schemes. And the happiness of semi-free roam for your dogs.
ps. Notice there are no sales or promotional links here - this is a real testimonial!
The systems use shock collars that "ping" the dog when it reaches a set boundary, and shock them if they go past it.
Shock level can be set to "really bad" which my conscience wouldn't let me use, to a mild shock similar to those "joke pens" from the gag store - which is the setting that worked great for my two medium size labs. And as a previous poster mentioned - after the first shock - they usually scoot back into safe territory when they hear the Ping (beep) warning.
Plus - the system lets you "dial-in" the size of the confinement area - down to as small as a 15 foot circle, or as large as a 180 feet circle.
AND the system is only slightly larger than a gallon milk jug.
Gus
"Of course I trust my political representatives ... just not with my liberties or my wallet" :
Camping with Gus