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The Glue they use for those brackets is an expensive Sikaflex type specially made for the job but depends on using a etch primer before application .
No way would I use anything less ,the three panels on the caravan I substituted the brackets for aluminium for greater coverage and an air gap for cooling .
Sikaflex for this is about $40 a tube and guaranteed for twenty years ,while we were on our trip earlier in the year I heard there was a fatality near Cairns? From a solar panel coming adrift and going through a car window .
Other thing I guess about a caravan over a car is it's not going as fast but now I wonder and hope the glue does hold .