I found a used 50 gallon RDS tank on craigslist for around $300, and ended up spending another $100ish for the hoses, wiring, diesel rated 12 volt fuel pump, filter head and the filter. Only use it when towing long distance as it comes out in 5 minutes once emptied.
Gotta watch your payload, but made my cross country trip last year less stressful as I could plan out exactly how much fuel I needed for a particular leg. Nice to be able to go 500+ only stopping where I choose to.
2006 Keystone Outback Sydney 30 FRKS
1997 Ford F350 Auto, 4.10LS Axle, 160,000 Miles, Crew Cab with DRW.
US Army 1984-2016.