Hi I am thinking of buying a 2004 Glavial Concorde shuttle bus: GMC C 5500, 6.6 Liter Duramax Turbo Diesel, Allison engine with 160,000 miles...

Does anyone know the life expectancy of this engine, how good it would be for towing a trailer, or any other important facts about this engine or the actual bus if you have knowledge..

thanks a bunch!