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Since it has been about a day without response, it appears that no one has tried or even thought of that idea. Thinking logically, there is a big problem with seat belts and proper anchoring.
Suppose you did this and had an accident where someone was hurt on that seat. Lawyers love to take cases like this. You'll be ruined for life!
I have seen motor homes with a second row of forward facing seats, but that comes at the sacrifice of living area in the coach.
There are friends, there are family, and then there are friends that become family!