Was looking at the pics on yours and good thing about W&P is some already come with the flat screen tv's installed. While not a complete PITA it does save you some time and money on mounts.
I really like the fiberglass on the W&P models. It's very thick, very strong, and keeps the hot and cold air where it belongs.
The one you are looking at is a 21 foot. That should be well within your towing range on the suburban I would think. Check for water and black/gray water capacities. A lot of tracks may not have full hookups and once you, your wife, your child, and whoever else start hitting that shower it simply doesn't last very long.
Mine has 80 gallon fresh capacity and same on gray and black devided. 4 days at a race and sometimes we have to drain bad stuff and refill the good stuff. Something to think about.
If you don't have a spot with electric hookups, might as well splurge for a generator. Your wife is going to need that AC and TV. This model is usually prewired for one, but sits on the toungue and looks kinda ugly, also in the weather.
Gens are way more expensive from the RV dealer, however if you go with a gen from Lowes, etc...some camp grounds will not let you run them since they are not installed into your trailer unit. You also then have to carry this around which takes up part of your cargo room and then set it up when you need to use.
