I agree with Matt. If there is any possibility that you will be trying to sell anything larger than a 1 ton, it can be a very serious money losing situation. My fascination with larger trucks is because I grew up riding in my father's fuel oil delivery trucks and then operating semi's for the past 46 years. I always tell people that are looking at an old larger truck to figure on more money to get it to stop than to get it to run. In addition to the costs Matt outlines, you have 6 tires instead of 4, if you have the RH 5 wheels, you will want to find some safer ones and insurance can be a problem. I grew up maintaining these things and still have the equipment. If I do it myself, like hone the cylinders, turn the drums on my lathe, rebuild the hydrovac I can save a lot of money. If I have my guys do it, it gets expensive because I have to show them how to do it. As a rule of thumb, figure every dollar you sink into anything larger than a 1 ton money in a black hole. You will never recover it.