Reddit reviews BEMONOC 752-2GT-6 Timing Belt in Closed Loop GT2 Rubber Belt L=752mm W=6mm 376 Teeth for 3D Printer Pack of 2pcs
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Circular arc Tooth Profile Tooth Space is Small, Suitable for Straight Line Driving.2GT System is an Extension of The HTD System With Greater Load Carrying Capacity.Breaking Strength: 86 N per 1 mm (62 lbs. per 1/8") Belt Width.Working Tension: 111 N for 25.4 mm Belt (25 lbs. for 1"belt).Temperature Range: -34°C to +85°C (-30°F to +185°F)
You can actually kill 2 birds with one stone on this one. I run 4 leadscrews on a single stepper motor. If you use a single motor, you don't have to worry about synching issues (or multiple steppers being run by a single driver). Due to the gear ratio of the pulley, a single motor can easily push the bed up and down on my 15" x 15 MIC6 aluminum plate that's 1/4 inch thick.
You will need to update your firmware to increase the steps per mm on the z axis, but it's not a huge deal.
Here is a pic of mine with the 4 leadscrews: https://imgur.com/dkYNHXN