I use a couple of shelter options to supplement the RTT depending on the situation. At times I'll bring the ground tent I used before I got the RTT. I'll use the REI 6 man tent for gear storage, changing room and shelter from inclement weather. I've also used our 10'x10' canopy, but it does take up a bit of space when packed.
Last year I picked up this compact canopy that looks like it takes up about the same space packed as the Kelly Mirada. At 6' tall, I'm not quite able to stand upright but my 5'5" wife has no problem and likes to use the canopy as a shelter for the camp kitchen. Set up is very quick and it is truly free-standing and can be staked in place for windy conditions.