Roof Noise: After Installing Roof Rack to Troopy

Recently installed an ARB 2.2m tradesman type roof rack having 3 legs on either side which fits into a channel slide.

Since installation, I have noticed a discernable noise (a moderate level bang) being emitted from the internal roof support that houses the courtesy light just behind the driver's head. The noise is not consistent in that it occurs sometimes when cornering or encountering bumps.

Initially it felt that something was moving within the support housing, but upon investingation I came to the conclusion that this could not be the case as there is no moving part. There was a degree of difficulty in undoing the roof support as after unscrewing the 2 x 2 screws the unit stayed in place because of a degree of pressure on either side, it was also difficult to refit.

I get the impression that the roof rack makes the roof more rigid, and I was surprised that there is a fair degree of flex in the roof (only the metal roof, and the plastic foam glued roof lining) and it may be that this flexing builds pressure and upon release the energy is released into the roof housing.

The roof rack is securely fitted and there is no discernable movement after standing on the roof/vigorously rocking with the assistance of others.

I have no concern that the roof rack will not do the job of carrying a spare tyre/tent/and other light misc gear: the only concern is the noise is a little off putting - have any other Troopy owners had a similar problem.

Thanks for any response.

George