Almost 100% of RVs are garbage. You really have to get over that if you want to get one. Otherwise, rent. If buying a used one, how it is stored and how it was maintained is probably more important than its age. A 2 or 3 year old unit could easily be leaking and be in worse shape than an older one stored inside or covered. Most do not hold up to elements well, they are all poorly assembled, exterior parts don't hold up well to UV rays. They all take a lot of maintenance: it's a combination of a cheap vehicle, a cheap house, and it all bounces down the road! Major, major buyer beware market here. I've heard some people recommend getting a clean 3-5 year old unit vs. a new one, since all the manufacturing defects have probably been figured out by then!!
It sounds like a small class C is what you want. Class Cs are good for road tripping because they are more compact than a truck+trailer or RV hauling a car. Small class Cs usually sleep you over the cab but have all the amenities you would need. Class C's are also safer for driving since they have a regular vehicle cab and chassis that has passed crash tests. Class A's are just cardboard boxes on a drive train and they do not crash well. High-end Class A diesel pushers are an exception and can be very well built but can easily be several hundred thousand $$s.
I have a 30ft Toyhauler so I can echo your concerns with a having a big trailer - it is terrible for stop n go road tripping. I race motorcycles and leave the trailer at the racetrack all weekend and have the flexibility of taking my truck separately when I need to drive somewhere. So, trailers are good for some things, but bad for others.
If you plan on using it a lot, RVs are truly wonderful. You can have a house anywhere! If you are planning on having it for one trip, or occasional use, it is better to rent. Otherwise you end up maintaining it more than you use it.