Guys, I need help! The driveshaft is vibrating at high speeds.

Hello all! I'm dealing with a frustrating problem – there's a strong vibration at certain speeds, and it's clear the driveshaft is the culprit. It's particularly noticeable at speeds between 80-90 km/h. After reading through some forums, it seems like it's probably an imbalance problem. I'm now figuring out the best solution: Take the driveshaft off and have it balanced at a shop. It might be the best solution, but it's inconvenient and pricey. I've also heard it can be balanced right on the car. They do it on a lift without removing the shaft using some equipment. Has anyone experienced this problem before? How did you solve the driveshaft vibration problem, which method did you choose, and why? I want to buy a portable balancer Balanset-1A, like this for [url=https://www.ebay.com/itm/395459584873]Furnace Fan Balancing[/url] In this store https://www.ebay.com/itm/395385850861 Are there any tips or things to watch out for? I'd really appreciate any advice and recommendations!