I have a Berns Beaks bike rack. It also has the boomerang base and I have it mounted on my WDH using a long shank towball. I can fit 5 bikes onto it and then I hitch up the van. Takes a little bit longer to hitch up because I have to reach under the bikes to connect everything. I travelled to Bright this afternoon with this setup without issue. When I leave on Wednesday I'll post up a photo (in my rush today I didn't get any piccies, sorry!!)