You also want to keeping mind that you are going to deduct your fuel cost as part of your business expense. Insurance wise you may find out that you are going to have to,list your truck on the business insurance. Ie no taking the boat to the lake with the truck that you use for the business. Most will not over it for personal use.
We have 2000 f-350 crew cab with a 7.3 diesel. Pulls 15-17k without much notice. It's chipped and has an aftermarket intake and exhaust too. Still pulls down 18-22mpg unloaded.
I recommend you look at manual transmission models in the early dodges or make sure someone has had the automatic overhauled before buying them. The autos in the early dodges are rather well known for issues. Always wished we could have bought what you could buy in South America from ford. A ford f350-f450 with a 5.9 Cummings.
Also avoid the 6.0L f350s that have not had the egr bypass done. They are bad about the egr coolant system leaking and causing head gasket issues. For all f350's, order the late model spare crank sensor and IPC sensor. Keep both in your glove box. Each will fail at odd times.
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