I don't know anything about suspension, so I am sorry but I can't help you there.
I don't know if the winch is something that you see yourself using in your business, if not, don't consider that as a part of the selling point of the truck. As a work truck, you don't *need* the running boards either. I don't know if you are in an area of the country that gets snow, but Full Size Bronco's make excellent plow trucks.
My impression is that Bronco's with plows don't sell for too much more than those without them, and definitely much less than purchased separately. Granted one would have to take a closer look at the mechanics of a plow truck vs one that sat in a driveway.
In closing, even though the truck could be a business expense and you could write it off, that doesn't make it free. Instead of paying double the $2000 book value of an Excellent rated truck to get this one at $3500-$3800, I would consider looking for an excellently rated truck in a newer model for the same price. What does an excellent '96 value at? (Personally I like the '96s they are the last production year, have whatever improvements were made to the transmission over the years, and a newer computer that makes diagnostic trouble shooting easier.)
Street tires won't look as cool, but will give you better mileage, and a more comfortable ride. They will also be a little cheaper to replace, and will last a little longer.
So there you go... I haven't given you any answers, just more crap the think about. Should you decide to purchase this particular truck I would start at the excellent book value $2000 in negotiating a price, complain about the price of gas, note that the trucks as gas hogs are coming down in price, mention that the winch is NOT much of a selling feature on a dress up truck, that it doesn't have a reese hitch. The low mileage of the vehicle is already included in the blue book value consideration.
Have fun!
joe