I forgot to mention that PepLink has 5 different multi-WAN routers.
At this link you can compare the features of each:
http://www.peplink.com/support/comparison/
They have dual-WAN, triple-WAN, and an expensive 7-WAN router.
I found this company from a nice write up on this web site:
http://gpsinformation.info/joe/route...Nroouters.html
Check it out....
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Larry63