we have one for our Troll 540 GT and very pleased with it , make sure you clean the body work where the buttons self adhere to with the supplied cleaning spirit cloth and they hang on just fine . I always clean the front of the caravan before fitting so no particles can scratch and we have towed miles with no marks.

We don't use a towing cover, although we have sometimes had a lot of dirt thrown up on muddy roads.

We put a good dose of polish on at the start of the season and a soapy sponge and a spray of cold water soon cleans it off. After 6 years we don't have any stone chips on the front of our Troll
MikeT

We have a pro cover towing jacket and have used it since May when we got the van.
It has done it’s job just great and also offers some protection against stone chips. It’s easy to fit although it could do with a press-stud at the bottom corners.
I rinse off the windows with a watering can before fitting, just to wash off any dust and avoid scratching.

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Instead of press stud at bottom corner.