A BIG thank you to all the forum members for taking the time to formulate a response. I was able to create what I need by using Shane's method where you use 3 profiles to force the shape to stay square.
Since there seem to be a number of different ways to achieve the same goal, I'm going to continue to experiment with some of the other methods.
@ Danny: I am definitely going to take a look at your method. This also looks promising.
@ Pilou: the fiber springs in the wheels provide suspension. I'm especially interested in these wheels because I ride a Raptobike low racer recumbent (see picture). The small front wheel is uncomfortable on the bumpy Belgian roads. The specific layout of the bike does not allow any other form of suspension.
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