Don’t know anything

Could use a little more information... Is money an object? How big a travel trailer?

Yes a little more info, 'full time, lots of travelling or stationary most of the time. Single or family in the RV, needs work station or something else.

My suggestion would be to start with a used unit, new unit kinks should be worked out, How much do you want to spend? If used and you decide that you don't like the life style, not as much money invested.

Get or decide on a particular RV first, then look for a tow vehicle. Go at least size bigger on the tow vehicle than you would need for that trailer. i.e. if a 150/1500 is adequate to tow the trailer, look at 250/2500 or even 350/3500 series that will make for a more relaxed tow, and may accommodate your next trailer when you decide your original choice is TOO small.

Ken

1. Used since first year deprecation on TT and TV are high.

2. Look for a floor plan with lots of storage -- not a brand name.

3. Get a Hensley Arrow or ProPride hitch.

1. Buy or select the TT first...then match a TV to it.
2. Think TV "payload" first and then TV max tow weight.

Get down to an RV show. Walk through some trailers. Do not buy anything. Give us your thoughts. We can then estimate what vehicle can pull what you are thinking about.

Unless money is easy I always recommend starting with a preowned RV. Probably same for the truck.

Well, I could swing the money, but the money supply is far from endless, so I would like to make smart money decisions. I guess space for four. Just me for sure, but I could see others joining at some point. Full-time. I can see 2-4 weeks in one location before moving on. I have read people writing about some brands with poor manufacturing, leaks and busted floors?

The questions for the OP start with trailer size, which also then dictates Truck size, and drivetrain.
One person alone even with some dry camping can get by with a 25' box and a half ton truck pretty easily. ie; a F-150 with a tow package and either a 5.0 or 3.5 Ecoboost.
Mid lever trailers for example could be 2520 Passport models or 223rbs Coachmen.

Or you could look for heavier trailers, with longer living spaces, and go to 2500-3500 trucks with or without diesel powertrains.
It's all up to your taste and wallet depth.

full time is a different animal. how much "stuff" will be living with you. I camp light but for an extended stay would be very heavy. Also how mechanical are you? maintenance will be constant. the problems you mention are more often than not from lack of upkeep not from a brand specific problem.

Here's an article on new vs. used:
https://learntorv.com/buying-a-rv-used-vs-new/

Lots of decisions. Unless you can shake out the bugs before you launch (and I strongly recommend that), getting warranty work done is more difficult as a fulltimer because you can't just drop it off at a dealer. There are still mobile RV techs and RV service centers + getting reimbursed, though.