T-310SR and T-320SR comparisons

[EMD_Driver]

I was looking at the Sunline website and found these specifications for the two models. Not really much difference.

2003 T-320SR
Length 33'-2"
Width 8'
GVWR (lbs.) 10,000
Sleeps 6-8
UVW (lbs.) 6380
Awning Size (recommended) 21'
Axle Weight (lbs.) Dry 5605
Fresh Water Sys. (gals.) 32
Hitch Weight (lbs.) 775
Gray Water Sys. (gals.) 35
Interior Height 6'-6"
Septic Sys. (gals.) 30
Exterior Height (add 9" w/AC) 9'-10"
Furnace BTUs/Auto Ignition 31,000


2004 T-310SR
Length 31'-10"
Width 8'-0"
GVWR (lbs.) 10,000
UVW (lbs.) 7150
Interior Height 6'-6"
Exterior Height (incl. A/C) 10'-7"
Awning Size (recommended) 21'-0"
Hitch Weight (lbs.) 950
Fresh Water System (gals.) 40
Gray Water System (gals.) 35
Septic System (gals.) 40
Furnace BTUs/Auto Ignition 31,000

They didn't list the axle weight for the 310... I'd like to know what they were.

Our CAT scale said that our axles weighed 5420lbs. They listed 5605lbs. I wonder where the difference lies...