Forgot about the small tank in my old Dmax. Yes that makes for short trips between fill ups.
IMO the bigger replacement tanks are cost prohibitive unless you plan on using the capacity regularly for a long time like a full timer or hotshot driver.
Don't worry about rollover and accidents with the tank. You could have the same issues with your truck tank if you got hit right. It's diesel to so your truck really can't explode anyway.
With a cheap slip tank and 12v pump or even hand pump, yes you will still have to stop every few hrs to fill up but they can be 5 min pit stops in rest areas or off ramps. Way quicker and easier than hitting the truck stop each time. You can time your fill ups more around your schedule or fuel prices if you're gettin 100 gal at a pop the savings will be more significant.
Plus you can power through when you normally would "have" to stop because no fuel for next 50 mi or something. You can run it low on fuel because when the low fuel light kicks on, a full up is only 3' away from your filler neck!
Burn some more fuel because you kicked it up a notch or headwinds, who cares, just pullover and pump some more fuel in!
If I didn't need the bed of my short bed truck I'd drop a slip tank in it just for ease of use and refueling even though I don't tow heavy or far very often. Woulda been real nice on my way to Alaska last year if I didn't have the TC. Could have passed on those $1.50/litre fill ups!
