This is what we have been doing for the last 3 yrs and the straps stay tight
drive vehicle onto dolly
back up vehicle on dolly to rear stops
put the car in neutral
hook up straps and start tightening them
car will roll forward as you tighten straps
put car in park-close the windows (don't ask me how we know)
In 3 yrs over 12k miles I never had straps come loose -each time we stop for fuel or pit stop I check them and may have added a click now & then but never have they come loose
I assume your dolly has brakes-(I HOPE)
Good luck on your adventures Rich
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