i think they should change it so, instead of repairing something a complete 100% for ONE point, the should make it 50% for ONE point.  so if your UAV trailer is blown, you start repairing it, the first point should come at about 50% health restored, and then the other point at 100% restored.  the most repair points i honestly got in one round was 7, enemy kept blowing artillery, but i never had enough time to get 10, let alone 20.