Rednax, I agree your statement about the payload and trailer towing capacity. I have the stock tires and have a Ranch Hand replacement bull nose bumper for the front which adds about 200lbs to the front but gives me great protection and a hitch in the front for maneuvering trailers into tight places. My mileage so far has been between 12.5 and 14 depending on speeds and traffic. I usually cruise at 65mph on the highway and in flat ground I will get 13-13.5. All mileage is hand calculated.
I went through flight school in Corpus Christi and I wish I would have bought an Airstream back then and lived on the RV park at the NAS there like my older brother did when he went through flight school there.
Since I am moving I just did my weight tickets to be reimbursed for the trip. My 2005 Dodge Quad Cab 4x4 with Diesel with a full tank of fuel, toolbox full of tools, and the Ranch Hand replacement bumper is about 7300lbs.
2009 27FB Ocean Breeze trailer weight with no water and nothing loaded into it are as follows
Front axle- 4600 lbs
Rear axle- 3780 lbs
Trailer axles- 5500
Total gross weight- 13,880
Trailer weight loaded with most of what I will be living in it, full water, grey, and black tanks.
Front axle- 4460 lbs
Rear axle- 4420 lbs
Trailer axle- 6060 lbs
Total gross weight- 14,940
I'm still fine tuning my hitch set up and will post more weights as I get them in the future.