Travel Tray Question

[Syd]

I wasn't sure where to post this... I'd like to get the children (2 & 4) for Easter, a tray for their car seats. I saw One Step Ahead has a soft one, which I was contemplating. Does anyone know if this - or any other/better - travel tray would work will with Britax Marathon? (Both kids have the same car seat.)

I greatly appreciate any input!
Thank you!

Snack & Play Travel Tray: http://www.onestepahead.com/catalog/product.jsp?productId=534362&parentCategoryId=85184&categoryId=85218&subCategoryId=86220

[MamaKath]

I would check on the car seat board. They would have more info on it there I think.