Currently the only way to meet those requirements while mobile would be to have multiple accounts and a router that would load balance all the connections.
Sasktel offers 4G LTE that would meet the first 30 gigs of the requirements. It is throttled to 2 mbps after 30 gigs of data. 2 mbps is enough to do streaming video from Netflix.
You may find that pretty much all wireless providers reserve the right to cancel service if the end user exceeds their "fair use" policies. (i.e. we promised unlimited data but you are using too much; goodbye)
The other option is an RV park that allows cable connections (hard wired) to the camp site.
Have you looked at the "real" usage on the current accounts?
