I have to admit, we've been investigating options around this matter over the last week as we were in France. We ended up using an old lidded nappy bucket, with a toddlers training seat on top. It definitely served the purpose but was a bit difficult to negotiate after a couple of drinks
I think we'll still use that option, if only because we can't fit a KK in our car with the rest of the stuff. But I'm going to try and adapt a camping stool (no pun intended) so that adults can use it comfortably.
Amazing family weekend with old steam engines, classic car displays, market stalls, and full catering and bar. And camping on site - Save £25 by booking in advance.