Aux fuel tank or larger replacement

[fr1rd831]

I have a 2011 coachmen freelander 27qb with 55g fuel tank and was wondering if anyone has either added an additional fuel tank or replaced the existing tank with a larger tank.

[Duckogram]

I know of only one special use E450 DRW cutaway chasis where an aux tank was added on one side. I believe it was about 20 gal. What you seek is really a fuel cell like the ones used in racing applications. You will lose a storage compartment in the process. I have never heard of any aft of the axle replacement tanks larger than the oem 55 gal. You might try Rhodes, Boydwelding or FuelSafe to find some examples. I also believe the cost will far excede the benefit.