Look at what Iggy posted on 06/08.
The 2011 and 2012 Georgetowns with the 242" wheelbase has 8,000 lb axle up front and 15,000 lb rear axes.
I can not verify any other years.
Ours is a 2012 on a 2011 chassis. The 378 is on the 242 inch wheelbase.
As I posted it was ready to travel some water and 0 in black or gray tanks.
2012 Georgetown 378TS Fire Mist
2008 Honda Fit
ReadyBrake™ Surge Brake System integrated with ReadyBrute™ Elite RV Tow Bar