And there is this option straight from Ford. An F250 SRW that will tow a VERY HEAVY RV. Interesting.
"The F-250 Trailer Tow Package – High Capacity is Available on XL, XLT, and LARIAT F-250 Models.
• 6.7L Power Stroke® Diesel Engine
• Trailer Brake Controller (TBC) – XL SRW
• Increase GCW on diesel engine from 23,500 lbs. to 30,000 lbs.
• Upgraded axle
Not available with:
• 10,000 GVWR/9,900 GVWR Package
See dealer for additional details."