Pez, I am in TOTAL agreement with you! (although I don't think that there necessarily HAS to be a vehicle involved for it to be authentic dogging - original "dogging" occurred when people out "walking their dogs" came across couples playing [probably most often, but not necessarily, in cars] who didn't mind being watched, and sometimes even invited the spectators to join in...)
As far as I am concerned, it is NOT dogging unless a couple or at least a female is involved in the activity - guys looking for m2m hook-ups at the park, or in shopping centre toilets!, are just guys cruising, NOT dogging as you rightly point out. The likelihood of finding people of the opposite sex at shopping centre toilets or so-called glory holes (between male toilet cubicles!) is so remote that I am surprised that people persist with this idea....
BUT, the Dogging page on this site has become a de facto "adverts" page, not the Dogging Locations reference page that it was intended to be. And the users got very upset when the new website was brought in and it became just a "Locations" facility as intended, and we then had to lobby the owners to make it into an "adverts" type of page again (because folks had become used to placing their "dogging" [vs swinging?] adverts there instead of under the Personals, where they actually belong)....
So ja, a lot of what we see as "dogging" posts on those pages are nothing more than personal adverts placed in the inappropriate place (but strangely a place where others are expecting to find them). So one has to sift through all the nonsense to find the occasional gem of a couple proposing a dogging meet-up somewhere, and the even more occasional suggestion of a new suitable dogging site... Really doesn't happen often, and oft times there is a no-show for whatever reason, and then dogging unfortunately gets the reputation of being just "talk and wishful thinking"... But fortunately, every now and then something really fine does happen!!! - and the true doggers are eternally grateful to those couples that are prepared to do it!!!