Larry, I think I would stick with the 3/4 ton. I think some states look at a 1 ton truck as commercial, and as such, tags and personal property tax is much higher. Did you know that the Farm Bureau has a $500 rebate on new Dodges?
Also, you may want to consider "slightly used". Start looking on Autotrader.com. I found my truck on there, it was bought by the original owner almost a year ago and traded in February. Its an SLT with the standard cummins engine. Over about 7 tanks of fuel I average 17.5 mpg. Hiway mileage around 21-22, city around 14-15. I'll try to attach a picture of my truck with tractor and trailer. Mileage as shown is 14-15, mostly hiway.
I'm a Dodge fan, but I do like the Ford 3/4 and 1 ton pick ups. I do like the GM, I just don't care for their styling. My Dad has a GMC and its plenty capable Buy same as a your tractor-the best deal at the best dealer you feel good about.
Doug