H.G.
I am constantly looking for the perfect rolling rack for my work (wardrobe consultant). Good ones can get really pricey. They also can get heavy, making it difficult to transport in and out of your car. If you don't want to spend $60, try the second to cheapest one from Walmart. It is about $20. It is better than the cheapest one, and better then the next on up for around $29. The bars are light enough to handle. I think this rack is relatively sturdier than some because it has 5 cross bars at the bottom. You can skip the 'hat rack' to avoid it becoming top heavy.
Another place to look is Modern Fixtures across from the demolished apparel mart on I35...if you want to make an investment.
Good luck!