Mine, like a lot of others I think, has split where it joins the metalwork, just below the jockey wheel tightening handle as can be seen in the following photo:

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I sent an enquiry off to my nearest Hymer dealer here in Hungary asking for a price and delivery, he came back to say that the only one available is as shown in the accompanying photo and is approx. £166 The one shown will not fit my 2013 Troll:

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Any suggestions as to what my options are?

Is it possible you can get it off and fiber glass a repair from underneath?

I don't think it is GRP, more like ABS so I doubt it's repairable.

I have successfully strengthened the backs the quarterlight mouldings with grp. Sticks just fine. A grp repair of the underside should be simple enough.