Just remember that 7 1/2' is a ST series (3 trip springs), right? It is a residential duty, homeowner type plow. By putting wings on it it is increasing its load potential (which is weak to begin with).
I would continue with the 7 1/2' but continually keep your eye out for an 8-8 1/2' C (Husky) model.
I installed a 8.5 Fisher V on a 03' Ford f-350 4 door crew cab with 8' box and 6 speed trans to boot,not my ideal plow rig but the owner has had no complaints,he taped the Fishstick to the shifter with so much tape he can shift with the Fishstick
alot of landscapers use those trucks.i know one has 4 f350 drw super cabs 4 doors with platform rack bodies and 8 ft meyer plows.you learn how to use what you got.good rig if you had a crew of guys working for you
I have an 03 Chevy 2500HD Crew cab and for the type of plowing I do its not too long. I do roadways and large lots so I have no problem with it. I also Have a 7.5 blade on it and don't have a problem when turning with my rear wheels going through unplowed snow. Is it tight in a culdesac? YES. Would I want to use it for driveways ? No.