'Splain to me why you would want to carry around 300lbs of steel that will never be used!!!
I'm not 'dissing' the Kilby's. They are a great product ... for the right application ... but not for re-sale value. Just trying to figure out your logic. Why should 40lbs of unsprung weight be avoided at all cost but that much sprung weight is OK?
You should now be expecting a treatise on rotational mass/inertia/braking ability/bearing loads/overworked suspension components(shocks esp).....