I towed a mid-sized #1,000 lb. U-Haul compartmented with an 800 lb. Cub Cadet lawn tractor enclosed and attachments halfway across the country with a 300SD with 100K miles on it.

Went fine, just accelerate with patience, and do not overload/underload the tongue weight. Use your head and drive 60 mph or so.

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'06 E320 CDI
'17 Corvette Stingray Vert