you need some skills to bring the truck to a successful stop

True, but that's skill most drivers don't have. Add in-wheel pressure and temperature sensors-- plus scheduled maintenance checkups and that problem mostly goes away. There are also numerous examples of adaptive control systems landing aircraft after major failures (quadcopters with 3 props, planes with 1 wing) that humans can't handle.

You bring up good difficulties. Still-- most of those problems have solutions and I sure hope it's sooner than 50 years from now we see self-driving long-haul trucks on the road.