I thought of that and our mec's have large enough rollers and a sufficent diameter for wires. We also will use a pnematic suspension on the rear two wheels to accomidate non flat surfaces. But in the end our 4 super cims should power through the bumps
And we have no problem going over 4 inch bumps on our wheelchair powered cart. Ground clearence, grippy/large tires and way to much power is key.