I have two RRS, a TVC-33 for primary use, and a TVC-24 for travel. Peter has some good recommendations and I also suggest looking at the TVC-34 and also the 24 for your load capacity, weight and collapsed dimension requirements. Both are quite short, light and robust. The TVC-34 is an inch longer than the 24 when collapsed while 10" taller in extended-height but the larger-diameter 3-series leg-apex and extra pound of weight is another thing to consider as well along with what head you'll be using.
The TVC-24 with BH-40 is a total collapsed length of 22.2". Mine pictured below is a little longer at 23.5" but I have two additional clamps between the head and legs, one for a removable carrying strap and the other so the ball-head can be removed from the legs easily (dovetail on the bottom of the head). When the ball-head is removed the legs are just 20" (with clamp) when collapsed and the ball-head can go in the camera bag. It is a little extended-height limited for taller people (I'm 6'1") but for it's uses as a smaller lighter travel-use/lots of walking/hiking tripod, it works perfectly. I pretty much never need shoot above eye-level when out and about and crouching down to frame upwards isn't a deal-breaker for me but might be for others.
Even though both the 24 and 34 are 4-leg sections, they're much more stable than my 3-section thicker-leg (aluminum) Manfrotto I keep around. Regarding center sections personally I avoid them now but you can always add and remove them pretty easily with RRS.
TVC-33 and TVC-24, you can see how much narrower the 2-series apex is compared to the 3-series:
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Though the TQC-14 is another consideration as it's their smallest and lightest overall tripod and comes with a center column like Peter mentioned (which is also removable). It's just as strong, there's a photo of the RRS owner hanging his entire body weight from one demonstrating that all RRS load-capacities are pretty conservative: http://blog.reallyrightstuff.com ...3/03/TQC-Joe-1024x656.jpg
I got a hands on with the TQC-14 when I visited RRS and was extremely impressed with it but ultimately decided on the 24.
It's a tough decision to make spending this much on a travel tripod, I wasn't going to spend this much without a hands-on/trip up to Obispo, so hopefully this personal experience helps as not everyone can get a hands-on before buying.