The max width vehicle allowed on public roads w/o special permits is 8.5 feet (102") not counting awnings, mirrors.
So any RV you buy will be very, very wide and LARGE compared to a sub compact car/SUV. About the smallest width RV (travel trailer) which is large enough to walk into and stand up is at least 7.5' wide and most are 8'.
Nakamuru,
I assume that when you are driving your sub compact you "become the car". That is as you drive you don't constantly think about where the corner of your bumpers are as you pull into a parking space, or drive near obstacles. You KNOW that your bumper or side of your car will not hit the obstacle, just like when you walk you know (as long as you are paying attention) you know your body (shoulder/arm, etc) is not going to hit a post/wall/other person.
Additionally, as you are driving your car, you have a very good idea where your tires are on the road so that most of the time you can aim your tires to miss a pot hole or a large rock in the road.
So if/when you buy ANY RV you are going to have a learning curve to get to the point that you become the vehicle just like you are in the car.
One of the things you will want to do, especially with a large vehicle, is to intentionally slowly drive to the right or left until your tires hit the lane markers in the road bed. Only do this when there are no other vehicles around. You want to practice to learn about when your tires are going to touch the lane markers. You probably already know about when the tires in your car will touch the lane markers. You just never have thought about the fact you learned this by just driving.
I will not try to convince you that "I" feel as comfortable driving my 36' Class A RV (think of a city bus is size) as I do a regular sized car or the mid sized pick up we have. Because I don't feel as comfortable. Also when I first drove my then 40' Class A RV, 12 years ago, it was really intimidating. I felt it took me about 1000 miles of driving before I felt like I "became the vehicle" and not constantly wondering where the sides and corners of the vehicle are.
I have about 200,000 miles of driving RV's from pickup campers, travel trailers, 5th wheels, motor homes. A lot of those miles are on 2 lane roads, in mountains, on flat lands on city streets, even single lane roads in National Forests.