Laser Level How To! If ONLY ONE Ventrac Attachment??

Detailed Description of How we use the laser level to create a level pole barn floor.
If I could choose ONLY ONE ATTACHMENT for the Ventrac, which one would it be?

Laser Level: https://www.amazon.com/dp/B079V4QCT3/?ref=exp_tractortimewithtim_dp_vv_d

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