That looks like a good solution for extra fuel capacity. A friend has one on his Jeep and really likes it. Something to keep in mind though is that the Aluminess tire carriers are rated to hold 100 pounds.
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Larrie
Read detailed trip reports, see photos and videos on my travel blog, luinil.com.
Current van: 2002 Ford E350 extended body camper with Colorado Camper Van pop top and Agile Offroad 4WD conversion.