The hypocrisy is insane.
A quick search showed this story making the rounds in March and it went away for a while when the French said it wasn't happening.
If the plan is to give up the Donbas to try and save Crimea, that's insane. When the Ukrainians get to the Azoz, they will have the ability to shut down all sea traffic in the Azoz and the Kerch Bridge, which turns Crimea into more of a trap than a possession.
Transporting tanks via truck trailers is common. Russia has mostly used trains instead of tank transporters, but pretty much every army uses them. This is the US Army version:
Oshkosh M1070 - Wikipedia
Tank treads wear out fairly quickly, they are a much more complex mechanism than wheels. The engine and transmission are also tasked with moving a lot of weight around and they are difficult to repair and/or have short life spans. The transmission on the T-34 was only rated for 1500 miles.
Russia's army is in bad shape, but using tank transporters is not really an indication of weakness. Of course if they are only using tank transporters because the tanks won't move on their own, then that is a sign of weakness.