There is also the replacement tanks. if you have a longbed, there is a 54 gal tank. for the shortbed, I think it is like 45 gal. too expensive for 10 gal or so...
you can have someone build a tank that hangs on the right side. like the old chevy saddle tank... ..... Or go to the junk yard and find one of those tanks... ...
Lotsa possibilities... . good luck.
Eric