I would have posted both those links as well. I find that the irv2 website covers just about anything you ever wanted to know about any kind of tt, 5'r, Class A or class C you could possibly want to know.
Here's just my 2 cents: We recently traded our 28' OUtback with bunkhouse and slide for a 32' Class C. We pulled the OUtback with a Ford Expedition. Now, we went about it backwards from what was recommended. We knew we had to buy a tow vehicle (face it, a Buick LeSabre just don't cut it), so we picked out the trailer first. We bought the Outback because it would fit all 4 of us, with friends possibly, and it was lightweight. I don't think I'll ever buy an ultralight RV again. While it saves on gas, they just feel rickety over time. We traded because our son, who is now 15, grew way too big to fit in the bunk, so we needed an extra queen size bed (he's currently 6'2" and still growing).
Whatever you choose, we traded a pop-up for the Outback and are so glad we did. We absolutely adore the RVing we've been doing. Nothing beats traveling - even to WDW - and bringing your own bed with you.
. . .by the way, our entire RV is decorated in Mickey. We call it the Mickey Mobile! The bedroom is Country Garden Mickey, and the kitchen is Classic Mickey. You'd be amazed at how many people notice, even on the highway. I'm thinking we need a great big decal, right in the middle of the back . . .