I am ordering an E350 6.0. I pull a 5000 trailer and put an 800 pound motorcycle in the van 4 or 5 times a year. Is the 4.10 needed, or could I get by with the 3.73? Maimum tow weights are the same for either in the van (10,000#). Would like better fuel economy, but don't want to be sorry the few times I tow loaded.

 

I would go with the 3.73. I tow a 12k lb trailer over mountain passes with no issues. You probably won't even know the 5k lb trailer is behind you either way based on the pure basic power of these trucks.