I'm leaving next Friday to start head west TO Washington. My trip is going to be a long pokey one so I don't know exactly where I'll be when after Ohio the weekend of the 17th but I'll be traveling I80 for most of it.
I'm not going veggie oil. Right now I'm just not convinced with the gumming issues in the fuel lines as well as other issues I may face. The engine is your most expensive item on your bus next to the electrical and tires and without it you won't get anywhere. I'm not ready to take the chance with something that will cost a minimum of $5000 to rebuild(in my old UHaul) when that gumming affects the cylinders. So far the "best" option I've seen for alternative diesel fuel is filtering used motor oil and burning that. Not exactly environmentally friendly but sadly even solar panels and other components are made from petroleum products. The other thing is that if you aren't installing the required components for burning veg you won't know how to fix the system should something happen on the road. Finding someone that knows how to repair it is another obstacle I considered. Given all the negatives I was facing I decided to wait until a more viable option was developed.
By "root" I'm assuming "route"? Or did you mean something else? If you mean the highways you are traveling I'm taking the flattest route possible. I don't know where you are starting from or where your destination is so I'll give you what I'm doing in the middle. Heading out of WA that would be taking your best way to I82 to I84 in Oregon. Continue on I84 to Salt Lake City in Utah where I15 runs into it for awhile then continue on I84 when they split. Stay on I84 to I80 then ride east for a looooooooooong way! I'm riding this route heading your way.
I'm a former truck driver so living on the road is nothing new to me. These next 2 recommendations were essential tools for me on the road. Obviously they are trucker oriented but since you won't be able to park that bus just anywhere these will direct you to your best options; truck stops.
Despite the cost I highly recommend this truckers road atlas which will help keep you out of trouble by informing you of low clearances(if you decide to travel on the little roads) that GPS just can't do as well as rest areas with truck parking. I definitely buy the laminated ones. I can't even begin to tell you how many times I've spilled something on them:
http://www.amazon.com/McNally-Deluxe-Ca ... pd_sim_b_1
and a truck stop directory which lists what amenities you can find(like showers and free wifi), this is the one I used:
http://www.amazon.com/The-Truckers-Frie ... 1890141437
The above 2 are the ones I used for 15 years. There are others published. You can look at them and decide at any truck stop.
Good luck on your adventures!