I think the reason for the small tanks is that model is considered lite or ultra-lite. Larger tanks would increase it's gross weight. If you only camp with full hook-ups this should not be a problem. If you dry-camp I don't think this is the trailer for you. Keystone makes similar floor plans in heavier trailers but I'm sure the price tag is higher also. If you are not completely happy with the trailer NOW, you are sure to find other things that don't fit your life-style after living in it for a while. Perhaps a different model might work better for you. JM$.02 , Hank oops! I almost forgot .... Welcome to the forum.
Hank & Lynn
2007 Cougar 290RKS, E-Z Flex, 16" XPS RIBs ( SOLD
.. Gonna miss her ... looking for new 5r)
2004.5 Dodge 2500 QC, LB, 5.9HO, WestTach gauges, Ride-Rite