Scott,
I Owned a 2012 Adventurer 86 fb for over a year. You state your is gvwr is 9400 and wheels are rated at 3640 lbs. My 2006 Dodge 2500 is rated at 9000. I had 17 inch Forged aluminum wheels which I read were rate at 3300 or 3400 lbs. and Nitto high load index tires. The terra were rated at 3750 lbs. I did add a leaf spring to each rear pack. Air bags, Bilstein shocks, and Helwig sway bar. My Dodge trucks axle is rated at 10,800 lbs. I do not have an upper overload spring. I assume your ford 250 has one. If you have one it will help with sway. I traveled near 10,000 miles with my set up no problems except for a little sway due to no top overload leaf spring. The 86 fb is tall with basement storage. I was looking into a pair of Super springs. Other than that my truck never new it was there. Sold it only because DW and I planned on buying a Fifth wheel but our circumstances changed. Wish I still had it to this day. I carry a 4000 lb. 11' 3" foot lance 990 now but upgraded to 19.5 wheels and tires. IMHO go for the 86 FB.
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