I am not sure who Explorers use as their provider, but its probably still a US based provider. WE have had Coach Net, but are now with Good Sam and we have been happy with the service from each of them. I would stick with a larger group who negotiates with more strength with the suppliers if there was a problem. JM2CW
My opinion is; If you are primarily camping in Canada then by all means keep your money at home and go with what appears to be a Canadian company. You will probably have great satisfaction with them. If however you camp in The U.S. most of the time or if you winter over in the South then consider a U.S. based company.
I got Coach net when I bought my new motorhome and had really good and reliable service for 14 years. Went to a Good Sam Rally and switched over to Good Sam roadside service. Haven't had to use them as of now but they also have a good reputation. I think either one is acceptable as no one goes in business to go out of business. Just my thoughts