I wouldn’t. First thing that comes to mind is accidents like the one James Cracknell had.
It might seem like I am nit-picking but apart from common sense telling me that’s silly the the lighting on that set up is also illegal. The load projects more than 400mm out from the outermost position light so a much wider trailer board is needed and I suspect it should also have a fog light and reflectors fitted (but not triangular reflectors as they are for trailers).
That land rover is say 70.5″ wide (google) and we have at least a wheel and half over hang in total which gives 2.78m width. Probably a bit less due to perspective but still over the limit.
A ford focus is a bit wider but 14″ puts you pretty much bang on the limit, the 18″ you mentioned earlier puts you well over.
edit: fork mount makes more sense but still tight. I think someone mentioned earlier about taking both wheels off (use a top tube type mount) which seems to be the most sensible for rear mounting to me and keeps your wheels safe from anyone clipping them.