After speaking with Britax, Sunshine Kids, Graco, Doral & Compass. All stated if your vehicle has a higher then the standard (40-48lbs) LATCH weight limit you can use LATCH on their seats to the vehicles full LATCH weight limit. Of course follow your vehicles LATCH weight limit and if it's not in there then contact the manufacture for that info or ask one of us with a LATCH manual and we can get that info for you.