Hey Buzzmonster, we've got a 2009 21RS (And love it!).
bikendan is spot on with the uplift for the UVW at about 400 lbs. The dry weight on ours is 4064lbs, but I believe the website lists it at 3600.
Our trailer has A/C, microwave, awning, RVQ, etc, so I think that's the convenience package you speak of.
I haven't taken it for some quality time on a scale, so I can't really comment on the other weights, but will let you know if/when I find time to do so.
One consideration about the 21RS is the lack of storage space. It's enough for us to get by on, but the 23RS with it's extra storage and wider bunks would be a good option.
Good luck with your search, and happy camping!
2009 Roo 21RS
2010 GMC Sierra 1500 w/ tow pkg
Nights camped in 2014:29 | 2013:33 | 2012:32 | 2011:33 | 2010:30