I'm still in, though I might be a bit late.
Paul, I don't know if your back problem's the same as mine, but when my back was bad, the only comfortable way I could travel in a car was flat on my stomach (we used to have a station wagon), or on my knees in the front seat in the reverse position. (I'm glad your a moderator and undertstand what we are talking about
).
I eventually got control of my back problem by doing "McKenzies" exercises.