Welcome. I have a few questions about your plans and perhaps a few suggestions. First if you plan using biodiesel how do you plan on getting/making it while on the road?
Also as an option have you considered finding a car you can sleep in? Perhaps a VW TDI passat wagon or a subaru outback or forester with the 2.0 boxer diesel swapped in? All of those options will be at least 40 mpg cars and have plenty of power to get through the Rockies and have awd which might be nice for some areas you'll travel through. A car would also provide more weather protection than a tent and is more sturdy plus you could focus on making your trailer more aerodynamic and lighter for even better fuel economy since you don't have to worry about sleeping on it.
Look up some of the trailer builds on here for some inspiration.
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Aiming for 50 MPG from an automatic.
See how I'm doing here, My Build Thread
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