Hi Sam,
Weird..just read your post and we have the same issue. my 3 year old daughter is VERY tall for her age AND we have a hyundai santa fe. i want her to use harness for as long as possible (with
LATCH, if possible). I too have found the
Graco Nautilus 3 in 1 (harness up to 65 lbs.,
LATCH up to 48 lbs.) and
Britax Frontier (harness up to 80?,
latch up to?). I think I'm going with the
GRACO.
GOOD LUCK!
Maura