No real recommendations on RV sales because everyone has a bad story at one or the other. I dont think it matters where you buy it from.
Figure out what you want. Go looks at tons of different ones and walk through them. Find the particular model you want and shop the entire country. Its very common to order or buy them from dealerships in other states and either have them shipped to you or you go pick them up. You can save thousands that way. I just helped someone buy one in Ohio and it will be shipped out here. Even with the shipping, it saved her about 4k. Lots of dealerships are not negotiating much on them because they are so popular right now. But the majority of those are smaller ones. But there are lots of dealerships that automatically mark the price down and have kept them down and sell in volume.
Warrantees have their good and bad. If you buy new, most will come with at least a year with the purchase. 99% of the issues with it will be within the first year. Typically if you have major issues later, its because you didnt get something fixed in the first year or you didnt do your preventative maintenance. If youre even half ass handy, it will save you time and stress by doing it yourself. Lots of people drop their trailers off for warranty work and dont get them back till 3-6 months later.
Another thing to do is consider what kind of trailer you want and what kind of camping you do. Even if you dont have a toy to put in back, look at toyhaulers. They typically have a lot of advantages that a regular travel trailer will not. Toyhaulers typically hold a hell of a lot more water than a regular trailer. So if boondocking is up your alley, I would get a toyhauler. They also have a lot of room you can use for things such as a porch. They also usually have onboard generators and travel trailers dont. And the on boards are nice because of the integrated fuel tank and you can just start the genny with the press of a button inside. Travel trailers will typically have larger insides due to the fact they almost always have slides and you dont typically get slides on a toyhauler unless you get into the really large ones.
Dont let them sell you gimmicks like LED packages or gap coverage. You can convert the LEDs inside with bulbs commonly found online for $20. Solar packages are nice only because the wiring is integrated. The solar products they put on there suck. But its very easy and cheap to upgrade and add panels. Gap coverage or loan/lease payoff can be purchased through your insurance company for2 bucks a month.
I personally have a 25ft toyhauler than can haul a 4door buggy. I specifically bought this length because lots of national parks have limits on length or if they allow larger ones, they only have a few spots allocated for them. I bought the solar package but mounted 2 180 watt panels on the roof and have (4) 6v batteries. I also converted to LED's and also run almost everything off 12v. The only thing I cant run without firing up my onboard genny is the microwave and the AC. I specifically shopped for a TV at walmart that had an adapter box on the power cord. That usually means the TV runs on DC but you need to make sure its the right voltage. I cut the plug and connected it to a fuse. Did the same with the blue ray player. My toyhauler holds 108 gallons of fresh water, but a lot of new ones will hold even more.
Dont be afraid of the size of the trailer when youre looking at it. Most first time buyers want the smallest one they think they will be comfortable in. They usually go to small. There might be rainy days when you are inside for most of it, so you dont want to be crawling around each other or dogs just to go take a piss. With practice, you will get used to towing.
Another thing to keep in mind is that trailers are made to be lightweight and therefore cheaply made for the most part. Unless you get into something like a grand design or similar in price, it will be cheap. They arent made with quality parts. Lots of plastic and lots of cheap wood.