I installed this bed extender by AMP Research on my 2018 Toyota Tundra. This is a full installation video. THis bed extender is lighweight, very sturdy and made in the USA!
You can buy the extender here: https://amzn.to/2To0TWa
Black mesh used in the video: https://amzn.to/38pd8Gd
Selftapping screws: https://amzn.to/2PP4Fpg