You don't need seat belts until you crash! I never got any good out of mine but use it every time. A teacher friend of mine used to take basketball teams to games in his motorhome - said it saved an hour a trip compared to a school bus because the kids all went to the bathroom with no need to stop. No, he didn't have a crash and didn't lose his job, but he should have.
I love having the bathroom and fridge aboard. But the best thing is stopping at a rest stop to use them and have a little break from driving.