An assortment of remote control vehicles with a nice gripper on each is really nice and very useful. Many times you will thank yourself for building once you do. put a light on it, even a camera if you want to get funky. Once used a crossbow pistol with fishing line to go thru drop ceilings faster. Buy yourself a $69 walmart 4x4 and make a hook and try it. Tie mule tape to it and drive her in there. If it works 30% of the time you will be happy. Gl.
This is CABL.com posting #300444. Tiny Link: cabl.co/mbqj2