I can't answer your specific question about the location of the tank and any design changes made, but I can tell you that a lighter tongue weight is not always your friend...you can find your trailer swaying and fishtailing if its too light. Make some test runs with the tank empty and full and be ready when its full!
2015 XLR Hyperlite 30HFS5 (mods being performed regularly)
2009 Salem LA 292fkds (gone)
Nights- ('12)23 ('13)23 ('14)15 ('15)31 ('16)25
2014 Harley Davidson FLHX (XLR cargo)
2014 VW Jetta TDI (diesel sipper, camping support vehicle)
2011 Ram 2500 CC 4X4 CTD, B&W Companion (toy hauler hauler)