My bad I meant 8000+ lbs GCWR not GVWR, anyway the colorado is out, I need that 8' bed for volume not so much the weight itself.
The biggest limitation is probably hitch load, noticed when the trailer isn't level loaded the truck's rear is all over the place.
Last year I accumulated well over 20,000 miles, this economy thing has me going much further for business than usual so good mpg's are important. Since I service the truck myself once outside warranty I prefer clean simple engineering.
More importantly I'm demoing a 1500 4.7 V8 Ram next week, it's not on my list but I refuse to discard any option before actually driving it.
F-250 5.4 V8 stand. cab, tandem trailer
Ferris IS3100Z 61" L Kaw, Hydrocut 36" 13hp Kaw
Shindaiwa T3410, EB8520 Maruyama HT2300, MS047
Stihl FC85, MS192T, 041AV, MS200