I wouldn’t get in any hurry if you’re just starting out. I have no clue how much you know about RV’s or what you have for a TV. Or if you have one. RV’s include everything from a MH to a PU trailer and they all best serve different purposes. If you can give us more background I think you’ll get much better answers to your questions.
Just some initial thoughts, though. If you’re interested in a FW you need to think at least ¾ ton truck. When I bought my ½ ton I was initially thinking FW. But as I got educated I realized the pin weight for a FW was a real load for it. The deal breaker for me, though, was it was too high to go back the forest roads where I camp.
Rubber roofs, my perception is that I don’t read much good about them on the forum. But I don’t have one and am not qualified to comment on them. There are some good entry level RV’s and if you’re a newbie it’s wise to look at used. A great many people don’t really know what best suits them when they start out and after using one for awhile they replace it. And that can get expensive if you buy new; they’re noted for their depreciation. Having said that, you tend to get what you pay for. But for a newbie I think entry level would work fine.