Howdy,
If you have a piece of equipment valued over $20,000 and it has a turbo, and you are trailering it more than 20 miles, COVER the exhaust.
The same reasoning goes behind if your were working the tractor hard pulling a disc, and you stop, you do not just turn off the tractor with the first 20 seconds. The turbo is a very special piece of machinery which needs to be treated properly. Many newer vehicles which have turbo's have actually added a special oil reservoir which will keeps a small amount of oil flowing to the turbo when you shut down the engine. It use to be one of those aftermarket items you would add to a turbo'd vehicle.
Cover the exhaust. It's not rocket science. Stuff a rag in it. tape a trash bag over it, tape it however you do it, just cover the exhaust.