Instead waiting for the rain to come why not use a garden hose, this way you can stop the water at any time and check for leaks. Put it where you think it may be leaking and test it out, its best to work your way up(bottom to top)
If you can get another person to help, remove as much interior panels as possible and have the other person use the water hose on the outside and you can sit inside the truck with a flashlight, should be able to locate the source of the leak within mins.
hope this helps
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