My thought is we usually build them wider now "because we can" and I don't mean that as a sarcastic reply. Back in the day the goal was to camp cheap, this is still the goal of a teardrop but back then it related to material cost big time, no Home Depot back then! So what is the ideal size when you were on a serious budget? It would be the size of the material so 4x8 sheets obviously dictate a 4x8 camper.
These days we keep the teardrop mentality but have easier access to cheaper materials (that's not being extravagant, it is STILL a teardrop!) so in this day and age, a 4x8 "TO ME" is under-built and a waste. You can build a five or size wide and easily see behind the camper with standard rear view mirrors and is still extremely light (unless it is your first build

) To build a 4 wide these days in my mind would only because you are driven by same same budget limitations like in the old days, so it is really about your budget or maybe if you are pulling on tight off road trails. My first teardrop was a five wide and my second one was built old school and the size of my materials literally dictated the size of my teardrop and it was 3.5' x 7'. My last one that I built from the ground up has the exact same overall footprint as my first teardrop but is a standy with a dinette and bathroom

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