I see a section just for horse box's in the near future:cool1: we have a 31yo Dodge 30ft 6.6ton, was a library then converted to horse box, we refitted it and registered it as a motorcaravan, have driven round Ireland and the south of england, wilding and the odd stopover on sites to do washing and empty tanks, but only a few will let you on.
As for the wilding, go for it, not sure re the horse you might have a problem as to where to graze it as i'm sure you don't intend leaving him ar her in the lorry overnight, i'm ex eventing now polo in sussex and have tried sleeping in the lorry wilst a horse was stalled on board, rather noisey and just a little smelly!!!!!! my only warning is there is a stereotypical attitude to people living in horse box's, "look George i think they are here for a big fat gypsie wedding" or because of the paintwork on ours, we get "have you got any king size rizlas maaan",
We have an onboard genny and a grinder and have used it more than once, on guy clamped us and said he was calling the council cos he thought we were committing an offence, i said call the police, he said i did that the last time someone parked overnight here and they didn't want to know, out came the grinder and off came the clamp!! and I kept the clamp.