Welcome to the Forum.
Would help if you fill in your profile a bit with what type of RV you have and or are going to be traveling with ie, Diesel truck with 5th Wheel, or Class A etc....
Usually the 50 amp RV's are because of duel AC units, and washer and drier set ups. My old 2014 Open Range 5th Wheel had a 50 amp cord but I could run everything on a 15 amp plug even the A/C unit, some times and hardly ever used that huge 50 amp cable.
I used a much smaller 30 amp cord that I had with an adaptor plug.
I also only had one A/C unit, and didn't have the washer and drier either,
50 amp to 15 amp plug50 amp to 30 amp cordWe got rid of our 5th Wheel and now have a camper for the truck. Wen. We ordered our new camper we ordered it without a A/C unit as we hardly ever used the A/C unit and we wanted less things on the roof to collect snow as we plan on using the camper in the winter months snowmobiling. We use our Fantasic Fan and wouldn't be with out it. Simple drafting with one window open keeps the camper nice and cool at night. We just got back from a month down south and never once thought we made a mistake by not getting the A/C unit when we ordered it.
Most roads in Canada are good, however just like the USA there are roads that are bad. There are low over passes / bridges up here as well, so they are out there. And I am from western Canada so I can't speak for the eastern provinces, however out here over passes and bridges are " usually" marked with a height on them.
Soup.