The GY Endurance line-up includes a new - to the market - tire size. It's the ST255/85R16 LRG with a maximum load capacity of 4080# @ 80 PSI. However, IMO, it's not going to fit well in many of the existing Keystone wheelwells. The OD (33.1") may also hinder many applications. Also note that it's minimum rim width is 6.5".
https://www.goodyear.com/en-US/tires...ce/sizes-specs