I realise that there is a lot of 'echo chamber' effect here, as you all congratulate each other on being in agreement.
Several posts each since the last comment by anyone in favour of Brexit.

It almost seems a shame to bring in a level of reasoned argument.

The border as it is at present, is, presumably, the type of border that the Irish (both North & South) would like to see in the future.
Why should this change?

We already have different rates of duty on alcohol, tobacco & fuel between UK, Ireland, and also the various states of the EU. Customs officers are likely to stop drivers arriving from France or the Netherlands, and check whether they are bringing in excess alcohol or tobacco. This doesn't happen at the border between Northern Ireland and the Republic of Ireland. So we already have a 'special' arrangement as far as that border is concerned.
Surely this is an example of what is likely to be the case in future.

That is what Ireland want, and presumably what our negotiating team want as well. The only place a 'spanner in the works' is likely to appear from is the EU team.