Can't comment on the commercial aspect, but that's exactly my understanding of the rules regarding the caravan you'd take on holiday to France.
Yes, me too.
I've read somewhere that you should take the cars log book (V5C?). I do occasionally, but now we're not in their VAT club etc, they may be looking to check, as a permanent import must be subject to tax, and this is a problem at the Irish border
A few changes to documentation and rules following Brexit ref: cars.
Must take the V5C or VE103B if it's a hired car.
Green card required, plus additional one for trailer/caravan.
The one which will catch people out is GB stickers.
You must display a GB sticker on your car and a seperate one on a trailer or caravan.
Unless you have GB and the
Union flag on your number plate.
If, like most people, you have GB surrounded by the EU stars, then you must have a seperate GB sticker.
All fairly minor I know, but it helps to not draw attention to yourself in the first place.
They might then start looking for the sausages and bacon you are trying to smuggle in, for those that haven't seen the news you are no longer permitted to take these items into the EU from the UK.