Cool!
That M-H conversion is Heavy Duty. I love it.
I agree the flatbed is too long for the wheelbase.
Looks like it has a 1-1/2 or 2 ton rear axle (7.00-20 tires) with 10 studs.
Agree it would really be cool with a 9' Dually pickup bed.
Have fun with it, Safely.
