Hi John,
I'm running with the Losi axles. You just need to open up the original C-hubs, and either use the Losi steering blocks or solve the inch/mm bearing problem.
I tried the Losi steering blocks, but I think the geometry is off. So I went with the difficult solution. I am running with a thin plastic sleeve outside the Losi bearings, to make them fit inside the TC5 steering blocks. You also have to grind a bit in the steering block, as the bearings are wider. The other solution is to use a sleeve on the axle and the TC5 bearings.
I'm also trying to build a dynamic caster front end with parts from 12R5, but I have problems with durability. So no test results yet.
Best,
Peter Knudsen