Maybe Jerry can fuel manage around a 19 gallon tank, but I have not found a way to do that. At (conservatively) 10 mpg in 4wd, a 190 mile range is ok for a day trip, but doesnt work in places like Death Valley and the vast stretches of Utah where I often go. And it seems like the "usable" portion of the tank is more like 16 gallons rather than 19, further reducing range.
So, extra fuel is needed for many of us. It seems that by process of elimination, the rear is the logical place to locate cans. But I hate weight. Carrying fuel in the rear means a heavier bumper/ tire carrier plus the cans and fuel weight. A new quality bumper/ carrier = cans is going to set me back $1200, maybe more. Plus, for those of us who are solidly into middle age, hoisting around the 5 gallon cans is getting harder.
So, another option is a larger main tank. The GenRight is far from cheap (I snagged on for $2200 I think), but 31 gallons of "usable" fuel protected by a skid and sitting lower in the rear was a very appealing alternative at least to me. 300 mile range, no cans to fuss with, maintain lighter bumper/ carrier, cost of the GenRight was $1000 above what I was going to pay for a new bumper/ carrier + cans. Also the GenRight sits slightly higher than the stock tank.