Vixen Polarie and 7D w/ 100-400L?

Anyone have any idea how the Polarie will handle a 7D with 100-400L? Come to think of it, how about the Polarie with 7D and 24-70 f/2.8L, or 7D with 70-200 f/2.8? These body/lens combos look like they push the load capacity of the Polarie to it's limit.

Does anyone have any practical experience with the Polarie and camera gear similar to what I'm planning on using?

TIA

Rich
ice nine photography
Take only photographs, leave only footprints.