What's the question?
Are the availble, are they safe, how much fuel can I lift? Try doing a search, there are a number of answers, opinions and options.
Here is a list of just some of the options:
http://www.advancedaero.com/vans.html
http://www.safeair1.com/fueltanks/rv6ertanks.php
There are others, but I'm sure you can locate them.
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html