Sounds like they either didn't torque the hold-down bolts correctly or they didn't get the roof seal in the proper place.
Remove the inside grill and look to see if the seal looks right. If it does, tighten the bolts a little to see if that stops it until you can get them properly torqued.
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Salem 29RKSS Pushing a GMC Sierra 2500HD!
Gotta go campin!
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