Due to design changes in bikes, online sellers and the buying power of established shops, 
Towbars2U has decided to stop supplying bike racks, roof racks and other accessories. What once were popular sellers have now given way to a more bike/user friendly racks.

In My Opinion, I would not be wasting my money or time on the old 2 arm racks or A-Frames styles as bike frames and kiddies bikes tend to be a nightmare to place on them. Also the new Mountain bikes are a nightmare to mount as well. They end up in all kinds of drag on the ground at point angles....

My Choice would be for a Platform style rack, as the bikes are secured not only by the centre post but the wheels as well. My other choice would be Ball Mount over Hitch mount for versatility and longevity.
with a Hitch mount you're restricted to just that, a Hitch Towbar,
A Ball Mount Rack you can carry over to any car with a 50mm Towball(Tongue or Hitch).