We recently upgraded TV to a Diesel Excursion. I bought a 5 gal can but haven't carried it with fuel yet.
Two things make a difference for some.
Diesel vs Gas. The expansion rate and resulting smell inside a vehicle is quite a bit more with gasoline. Diesels really do not like air in the fuel, such as from a low tank.
The other is towing with SUV vs pickup truck with a separate bed. We would have to carry fuel inside the passenger area- although about 12ft behind the driver, LOL. Yeah, this thing is big.
We have at least 10 miles to the nearest diesel. It used to be almost 18 miles and closed at night.
There have been many times the fueling stations are closed, out of fuel, power is out, or something about pump maintenance or tank replacement, etc.
I've been on fumes in both gas and diesel more in the past 2 yrs than ever before. Maybe because we don't make a trip to town nearly as often.
Another consideration is pump access. We aren't near an interstate unless traveling. Few of our pumps have room for trucks, let alone TV plus trailer.
If you get the one pump on the end with diesel and can get around the cagers and gassers who use that pump and go inside to get their sandwiches...and then hope there is still room to pull out after filling up.
Have you seen what some people consider acceptable parking? LOL.
We have a 44 gallon tank. Filling the 5 gallon at least half way, to avoid spilling- is something I am really considering. Another 30 miles or so might just be the ticket some day, especially if we are traveling into unfamiliar areas.