We have had rear kitchen 5ers and they are no worse than any other trailer. The trick is to get a well designed trailer...one with a rubber in shear or similar type suspension...Dexter or the likes and good shocks. Cheaper trailers use only a spring suspension and probably no shock absorbers.
As for going full time, you need to rent something first and try it for a week of so. Being confined into a small box in bad weather will not work for some people. When looking for a trailer, make sure it has ample closets, drawers and other storage for your clothes, linens, computer, etc. Seldom do people stay with the first RV for for long. They find a floorplan does not meet their requirements.
You will want a full time four season trailer and $30k will only get you into a NEW entry level unit. For $30k in a full time unit, you are going to be looking a trailer over about 6 years old. With units of that age, you will need to be concerned with things like the refrigerator, A/C units, water heater and it will need new tires. An entry level trailer will not be well insulted and can be quiet chiller during a DFW winter.
With a unit over about 30' or larger, you will need two A/C units...a 15k BTUH and a minimum of a 13.5K BTUH to make it through the Texas summers unless you can park in full shade.
If you can, visit a Texas Boomer rally and talk to some of the folks about their rigs and your expectations it will be a big help. I am not trying to discourage you, but you need to look at all of the things you will encounter.
Amateur Radio Operator (KE5DFR)|Full-Time! - 2012 6.7L Ford Crew Cab Dually -2013 HitchHiker Champagne 38RLRSB - Travel with one Standard Schnauzer and one small Timneh African Gray Parrot