Its not hard to fab a new battery tray for the 2-6's. Unless you have a piece of junk for a tow vehicle the extra weight on the tongue is a good thing as it helps prevent sway. I put 6-6's on the tongue (talked to Jayco before I did this) with no problems so far
2004 Chev Silverado Duramax optioned past the max. 2009 Jayco Eagle 308 RLS 765 watts of solar, 6-6 volt batteries (696 amp hour), 2000 watt (4000 surge) whole house inverter.
140 days boondocking in 2016
211/2015, 196/14, 247/13, 193/12