What is Reddit's opinion of DEE ZEE DZ43105 Tailgate Assist fits 2015+ Colorado/Canyon?
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By popularity on Reddit, this product is:

I have this one on my 2017 WT, it works fine and wasn't terrible to install: https://smile.amazon.com/gp/product/B0844FSNRQ/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 (shouldn't be an affiliate link or anything, but if you haven't set up Amazon Smile I recommend St. Jude)

If you don’t have a dampened tailgate, I just got this and it’s a game changer.