I don't know how often and how many different wireless solutions you did use for similar setups.
My experience in 15 years is that there is very few of all this wireless- and not cheap -gear making this work porperly.
Wifi has limits big time (!) so if you are brave enough to try this out with more than two vehicles on the move your clinents should be ok with brake ups, pixelating etc..
Ipads cannot run as smooth as a COFDM Handheld, it's in the physics. It can perfom really good, and on the next day with a lot of interference cut 80% of range even if you find a free channel (if there is), getting pixels and so..
Dont ge me wrong. I love this feature- so do most directors.
No one wants to hold s.th. heavier as an ipad for monitoring.
Watch 2 or 4 cams with talkback to the VTR included..it's revolutionary-
Using this for several vehicles on the move though I would not recommend..
Maybe you did already since your question is a week old? If so may I ask how it did perform?