I'm sorry but US Halftracks used Kégresse tracks
A Kégresse track is a kind of rubber or canvas continuous track which uses a flexible belt rather than interlocking metal segments. It can be fitted to a conventional car or truck to turn it into a half-track, suitable for use over rough or soft ground. Conventional front wheels and steering are used, although skis may also be fitted.
The Kégresse propulsion and suspension system incorporates an articulated bogie, fitted to the rear of the vehicle with a large drive wheel at one end, a large unpowered idler wheel at the other and several small guide wheels in between, over which run a reinforced flexible belt. The belt is fitted with metal or rubber treads to grip the ground. It differs from conventional track systems by using a flexible belt rather than interlocking metal segments.
In the late 1920s the U.S. Army purchased several Citroën-Kégresse vehicles for evaluation followed by a licence to produce them. This resulted in the Army Ordnance Department building a prototype in 1939. In December 1942 it went into production with the M2 and M3 half-track versions. The United States eventually produced more than 41,000 vehicles in over 70 versions between 1940 and 1944.
I'm at work right now so I can't post pictures but later I will post pictures of an assembly factory that show workers installing tracks. They had to use chains to compress the bogie assembly so they can fit the one piece continous rubber track. When they release the chains the track goes tight. Any pictures of a halftrack with saggy tracks means they are not servicable and will have to be replaced. If a track gets torn it is replaced because there are no individual links like you find on tanks. The rubber tracks either had rubber cleats or could be fitted with metal cleats. There are no track pins on a halftrack.
German and Russian tanks have what is considered as static or dead tracks. Dead tracks have sag. American tanks have live or tensioned tracks and therefore have little to no sag. That's how they operate and if they do have sag that is out of spec they have to be re-tensioned or they run the risk of of being thrown.
Cheers