Thanks for the tips! I'll have to go back to BBB and install the frontier and the radian with my headrest removed and with them configured with the coccoro to see which fits best that way. I'm not opposed to getting the radian and eventually getting another booster down the road simply so we have two RF seats to shuffle between cars and grandparents One more question. Have you had any issues with using the latch with the radian RF? I've heard some complaints about it not staying tight or little feet being able to kick the clip loose. When I put it in though I could barely get it out! Haha! Maybe they addressed that issue ;-) My only other thought was the Foonf bc it's just SO cool looking. LOL! But I'm not sure if i Can onvince my hubby that the cost justifies what our needs are Have you seen it or gotten to play with it yet? My only fit concern in an envoy would b it's height.