Re: will Tow Behind Lawn Sweeper pick up thatch
Caveat, I've only used my sweeper twice.
If you set the brush height a little on the low side, it will rough up about 40% of the thatch. A second pass will collect it. However, if you are like me and have a less-than-plush lawn, the low brushes can rip up loose sod or moss.
I also purchased the dethatcher attachment for my sweeper: a Craftsman, made by Agrifab. This does a better job (50-60%) of loosening the thatch, but it's not a perfect solution either. The tines on the dethatcher ride close to the tires. (Close enough to force me to buy a tire plugging kit.) You also have to sweep the yard clear before using the thatcher, or it'll get clogged with twigs, sticks, and other debris.
As a sweeper, I give mine an A-. As a dethatcher, I give it a C.
JD X304 Yuppietrac, bagger, cart, plug aerator, mulch plug, JBjr, and a willingness to break them all.