Trailer or RV?
For road trip in US & Canada

Question: We are planning on an extensive road trip throughout the USA and Canada and are having a hard time between deciding whether to purchasing an Rv 21'-25' or a trailer. There seem to be pros and cons for each. Our main concern is when visiting larger cities of trying to find parking and negotiating the street, as I would assume that most camp sites a little out of town, whereas if we had a trailer we could park and drive into the cities.

We are green horns at this so would REALLY appreciate any input from any seasoned travellers. Any other hints or advise would be most appreciated. Many thanks!