Mike-s
Weren't you the guy who excoriated another about pointless insults on the forced router thread two months ago? Check the mirror. And buy better quality booze.
Build threads take time. Quite a few years on some forums. This one is still at at the conceptual stage. So questions about how to allocate a fuel budget are par.
The "utility" of a travel trailer design. Has to have inputs: propane, water and electrical "storage". And less directly, TV fuel. The "winner" is the combined rig that best fits the OPs wants. Separating out need from desire. Nights aboard on an annual basis AND total distance travelled. All of which can be quantified.
Let me spell that out for you: the TV spec which consumes less fuel towing and solo and that also is a close match to solo needs is the better choice. The TT need not be quite as efficient. Aero is then more about handling winds than pure HP reduction. A less dramatic shape. But first, a handle on annual fuel consumption via budget. X-dollars represents Y-miles. No matter how many or of what type.
If it's of no interest to you, why post?