Originally Posted by
Doug5150
I assumed the two wheels were mounted on a bogey. If that were the case, then the pair of rear wheels has a common pivot point, allowing them to separately ride up & down small obstructions.
Here is an example of tank treads using them (rather common)-
http://www.williammaloney.com/Aviati...ogieWheels.htm
It still leaves the steering problem though.
If they are to be mounted on a bogey, why not take the bogey's pivot point, replace that with a single axel for one heavy built wheel? From the cargo's perspective the weight distribution would be identical (all the support at the one point). and this simplifies the drivetrain.