I have a 2008 Fleetwood Discovery. Started out on a trip to Charlotte N.C. to watch some sprint car racing, lost a radiator clamp losing about six gallon of coolant. Repaired and back on the road. Our return trip stop engine light came on at Flying J after refueling, had to be towed to nearest Cummins dealer, turbocharger had to be replaced. The trip home lost a gallon of coolant out of the overflow hose, check engine light with low coolant warning. Stopped at Crosspoint Cummins and was advised to watch the coolant level possible the technician over filled. I've done the jug test (overflow hose placed in jug full of water) no bubbles but had white smoke and some coolant loss. I also have no bubbling in the plastic tank. I've said all of this to ask this question do I have a blown head gasket or EGR cooler leak?