does it work for wood?

Yes, the TCHD2L2S3BTS works for Wood.

How do you identify what full tension is on the springs? How many turns? What's the best way to identify this?

No idea, what I did was to set the tension, by trial and error, so that the door won't close too slow, to allow pets to run out or too fast to prevent door slamming and breaking other parts

I have a double trex aluminum gate attaching to 4x4 posts covered with trex vinyl post. Will these hinges work for my setup?

A more appropriate hinge would be the TCHD2L2S3. The TCHD2L2S3 has wider leafs so that the screws are spaced farther apart to reduce stress on the vinyl to prevent the stress pulling the screws out. This hinge can work if the aluminum is sheathed very snuggly by the vinyl, but you'd need to be able to confirm that before going with this model of hinge.

Material	Industrial strength metal replacement polymer, Stainless steel
Brand	D&D TECHNOLOGIES
Product Dimensions	4.75"L x 3.5"W
Finish Type	Unfinished
Mounting Type	Door Mount
Hole Count	4
Weight Limit	154 Pounds
Unit Count	2 Count
Manufacturer	D&D TECHNOLOGIES
UPC	736494012501
Part Number	TCHD1AL2S3BTS
Item Weight	1.51 pounds
Item model number	TCHD1AL2S3BTS
Size	Fixed gate gap is 8/10” – gap = gate frame to post
Color	Black
Style	Safety
Finish	Unfinished
Number Of Pieces	2
Maximum Weight Capacity	154 Pounds
Included Components	Fasteners
Batteries Included?	No
Batteries Required?	No

TCHD1AL2S3BTS TruClose Heavy Duty Gate Hinges, for Self Closing Metal Gates up to 154 Pounds, with Alignment Legs, for Square Gate Frame and Post, Black, 2 Count

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