Given that it's a 3-section with 28mm legs, it will certainly be fine, particularly when not extended to full height.
I'm currently using a generic taiwanese aluminium tripod of terrible manufacturing quality and similar leg dimensions (it's a Manfrotto clone); it is more than stable enough, particularly when you don't extend the legs all the way. Because of the WLF, I don't tend to raise the tripod very high with the RZ, so there's some extra stability there. Just make sure you use mirror-up and a release cable, that way there's only a leaf shutter moving in the camera and that won't cause vibration. If there's a high wind, you might want to hook your camera bag under the tripod to hold it down - the extra weight loads the legs and reduces vibrations due to external forces.
I've played with a 3401 or 3402 (don't remember which but it's a lot weedier than the 3342) and it would have been fine for the RZ at low heights.