They say if there is no loss of pressure after 4 hours you are good to go - 2 hours to go. I have a sunroof so not an option to mount it further forward. I might make a small bracket for the rear holder so that the wheel rests more securely. My bike does fit with the seats down but if it is filthy or wet I don't fancy it dripping on the upholstery.
Did a trial run and after a small wipe with a microfibre cloth there wasn't any sign they had been on.