Re: Carbon neutral
You are over estimating the MPG of a loaded tow vehicle. The Wife and I, four teenage girls, a four horse slant, four horses, and enough kit (including horse chow) for all ten of us over a long weekend makes for quite a bit of mass. The rig eats fuel.
Call it 6 to 6.5 MPG. The long range tank holds 30 gallons (stock is 20). That's 180 to 195 miles, or three hours between fillups in this configuration. Distance between Sonoma, CA and San Diego, CA is about 550 miles. Typically, I'll drive that one myself, it only takes nine hours or so. If we are going further, the Wife and I will spell each other at every other fuel stop or thereabouts.
Distances here out West are further than you probably realize.
Sonoma to Provo, Utah is about 750 miles. We do it in roughly 12 hours.
Sonoma to Tucson, Arizona is about 900 miles in roughly 14 hours.