[rjohnsonnm]

I have a 2004 36RS3 thst has a UVW of 12,638# (a little less than yours.) Back in 2006 I had each individual wheel weighed when it was loaded. The load included a washer and dryer, food, clothes, tools, but only about 25 gals of fresh water and no grey or black water. In other words, a normal traveling load. My wheel weights were: RF 3225, LF 3150, RR 2800, LR 3050, and the pin wt was 3575# for a ratio of 22.6%. Total trailer weight was 15,800 (200# below GVWR). I won't get into truck loading except to say that my F350 had a rear axle rating of 6830#. My load was 355# below maximum. (It seems strange that a Ram 3500 only has a payload of 2630#)

A related issue for that year MS is the tires. It sounds like you bought your MS used and if so, let me warn you about the tires. The stock tires DRV used were Goodyear LT235/85R16G G614RST. I had THREE tread separations on those 16" tires in 3 years, the last 2 on new tires with less than 10,000 miles. If you have those tires on your MS I strongly encourage you to upgrade to a 17.5" tire. I replaced my wheels and tires with Goodyear 215/75R17.5LRH G614 and now have 10,000 miles with no problems (cross my fingers)

Hope this helps.
Ron