If the outer fixings for the centre bar have flexible/rubber mounts, so they will absorb impact you should be OK.
You may find the external wheels get a battering but if you have a few spares you should be fine. (I think the tyres are solid BTW).
the only problem I think we may see with this design is the robot may rotate about the front axle when it is trying to lift something too heavy. like Big Nipper. But the body is a little longer and the reach is less, so it may be OK.