I sleep in trailer,like being near my horses The shows are like one big happy campground,Everyone sits & visits in evening ,BBQ etc. Either that or hang out at the stalls doing much the same. The socialization is half the fun of going to the shows!!!
As far as showering there is usually some public showers or the wash racks work in a pinch,if it works for the horse why not?!. My new trailer has a full shower but haven't tried it out yet