^^^^ Now There's ^^^^ Excellent Advice! Our gear is all Roadmaster, base plates for two toads, and the tow bar itself. We only bought one base plate new, the rest used. Base plate from eBay, Tow Bar CraigsList.
Since "ends" are available to match tow bar brand to base plate brand, I strongly endorse STB's note about installation. By reading the Install Instructions available for every specific base plate, you can determine How it will Look, the attaching Height, and how Invasive the installation is. Makes for a much more intelligent choice.
If you decide to install your own base plate, let us know what you decided on and we might have some tips.