I bet it already has a trailer hitch on it, which would be extended to accomodate for the long bed. And, it won't hit the ground or hitch when dumping. The pivot point is extended at the back- you can see it peeking out under the bed.
I don't think you have much to worry about. Most of them are set up like that, and are making the most of the setup- they tow, they don't interfer, and they have the most bed possible. Square footage in that bed is money in your pocket.
I have a friend who has a Ford F350 set up the same way. He pulled an equipment trailer with a skidsteer on it for a landscape business. The previous owner of the truck was the best, most successful landscaper in our area. They used the truck to pull an equipment trailer and a hydroseeder, with no issues. They did just about every new yard in the county, and I would see them all the time on jobsites. I know that setup will work. It's your money, your plan, your business- I'm not trying to convince you to do something that you are opposed to. I am saying that the truck setup does work for a landscape business because I know two owners of the same truck who used it for that purpose.
