I recommend any of the Roadmaster All Terrain tow bars. They come equipped with Roadmaster's Freedom Latch which allows the inner arms of the tow bar to rotate 360 degrees, eliminating the binding that can happen with classic tow bars. This makes for easy release of the tow bar from the tow vehicle.
This video shows just how easy the Sterling releases, even when there is a lot of tension:
Roadmaster Sterling Tow Bar - How to Use - YouTube
The Sterling All Terrain is lightweight - it weighs about 35 pounds. Roadmaster's other tow bars weigh around 65-70 pounds.
The Falcon All Terrain is a great tow bar also. It has all the same features as the Sterling, it just isn't as lightweight.
One thing to keep in mind when you are comparing the costs, is that the Sterling comes with safety cables and power cord (usually around $175) and the Falcon does not. If you subtract the cost of the cables and power cord from the price of the Sterling, the price is about the same as the Falcon. There is no option to purchase the Sterling without the cables and cords, that is just how they are sold.
The Falcon 2 is a great tow bar also, but it does not have the Freedom Latch (non-binding mechanism) design, so you don't get the benefit of always having an easy release.
This page shows a comparison of Roadmaster's All Terrain tow bars that you might find helpful:
Roadmaster All Terrain Tow Bar Comparisons - Tow Bars and Brackets
Hope that helps! I guarantee the lowest prices on Roadmaster products and am happy to answer any questions you may have.