There are some pics of the customers boats on de graff's site . Looking at the similar boats to mine on their trailers my boat does sit a little closer to the mudguards . It looks like the curved crossbeam that supports the roller assembly has a greater curve on the indespension also the the draw bar is bent downwards where it meets the trailer chassis .
My trailer is pretty low but never a problem on speedhumps etc . It only just gets in my drive which is steep and has a hump at the top as I go over the pavement . I had to cut the extended pieces of metal off that allow the front keel roller to be raised a few holes .
They are the same axle and wheels so i don't see how actual ground clearance can be any difference . I don't intend going offroading with mine anyway
The only thing I prefer on my trailer is the metal mudguards and steps because you can stand on them other than that its the price that counts most