Like you, I am new to the Travel Trailer scene. I have evolved from tents, to a slide in camper (91 Six Pac 78S model in a 65 chevy C10 short-wide bed). The wife and I are now looking at a Starcraft Autumn Ridge 245DS because it is small enough for us, and big enough for us at the same time. ;) Hope that makes sense...
We had originally thought that I could just upgrade the front end of the '65 (the back end I had already done to accommodate the slide-in) with disk brakes, power steering, and a new transmission. But the more I read on the forums here, the more I realized that I would be in the end destroying my 65 Chevy. Even with all the upgrades, no matter how "Cool" it would look towing the trailer, it is Still a 52 year old truck.
I have now started looking at a Heavy Duty 1/2 ton or 3/4 ton truck to do the job. Budget is the deciding factor, and even then, if I go with the 1/2 ton, there will be upgrades to suspension and engine/trans cooling before I tow a trailer Mile One.
Take what these people say with the Thousands of Miles of experience they have behind them. Almost all of them would not intentionally steer you wrong, and like I have, you will learn alot from their experience.
: Stepping off my soapbox :
Badger