Best Practice to tie up dog?

I have never seen a pen at the campgrounds where I stay (only at RV parks). As for tethers and tie outs, they are usually accepted IF the dog is being well behaved. A dog on a tether barking, lunging, etc., will result in the owner being told to put the dog on a leash and control it. A dog on a tether or tie out with no owner around will result in the owner being told to keep the dog on a leash and with them at all times. Of course, that is if a ranger or camphost is around to see it.

So, yes, the 6 ft leash IS "all the time" but most places will accept a tether/tie out IF the dog is well behaved, controlled, and in the presence of the owner.