Heading out camping but here is a quick note which should help you on most of what your asking on.
Your 2003 T2499 "empty" camper tongue weight is about 765 to 800#. When you fill the fresh tank, the water alone (no camping gear) will add about 200 ton 250# to the tongue. If you plan on hauling fresh water, this is the add.
When you fill the camper with camping gear and no water, expect a loaded tongue weight of 1,000# to 1,200#
Here is a pic of my Reese DC with 1,200# bars on my prior 2004 T2499 on my 2003 K2500 Suburban
Got to go now, out of time, be back on Sunday to answer more questions. Going camping. YEH!!! If you look in the towing forum here on the club, there is a post where I weighed a lot of folks campers tongue weights at our Meet and Greets. There are many T2499's in that list of actual loaded tongue weights. If you cannot find it, ask as other here know where it is.
Bottom line, the Reese 1,200# trunnion DC will do well by that camper and the 2003 T2499 has the A frame to handle it.
Heads up, the 1,200# hitch will work well with the camper, however that loaded tongue weight needs to be supported by the truck. Do not know what truck you are towing with. Can help with that too.
Congrats on your new camper. A nice coach you have there. Oh and Happy Thanksgiving.
Current Sunlines: 2004 T310SR, 2004 T1950, 2004 T2475, 2007 T2499, 2004 T317SR
Prior Sunlines: 2004 T2499 - Fern Blue
2005 Ford F350 Lariat, 6.8L V10 W/ 4.10 rear axle, CC, Short Bed, SRW. Reese HP trunnion bar hitch W/ HP DC
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