Judy- Yes, I have, with lots of sweating and swearing, installed the Roundabout. I haven't even tried my Radian because I heard it is not a good match. I wish I had known how funky the seats would be when we bought it. First, I struggled with my 9 year old. She has to go in the front seat in a backless booster since there is no head rests in the back. Of course the airbags are off for her.
Wendy- There was a post a few weeks back about the strange seats in the Tacoma. Usually the kids ride with me, but on occassion they do need to ride in the truck so I hope to find something that will work. My son weights 36 lbs.