I am assuming that it is the CB you have interest to buy. I have no knowledge, other than google photo's, of the keel version. I would have expected though with keels up, for trailing, that the hull shape would be so similar as to make no difference to an undercover. Certainly the trolley looks to be the same. With the hull weight being 190Kg, and then add some for the other bits, I wouldn't fancy trying to manipulate that on its trolley to fit the undercover. I've never tried though and maybe you have a method that makes it doable.