Up front, this particular Ford F-150 Lightning features what appears to be a different, more pronounced skid plate up front, in addition to more clearance around the front tow hooks. Speaking of those tow hooks, they aren’t exactly as strange sight, as the Lightning currently comes standard with them. These tires provide perhaps the strongest piece of evidence that this Ford F-150 Lightning is some type of Tremor prototype. Currently, all-terrain tires are a free-standing option for the Lightning, but they’re 275/60R20 tires. By contrast, these are 275/70R18 General Grabber tires, which are not only unavailable on the EV, but the exact same rubber featured on the F-150 Tremor. The wheels appear to be the same as the ones currently featured on the Ford Expedition Timberline. It is also worth noting that this pickup appears to have a raised suspension, which is a key feature of the Tremor.
Source: https://fordauthority.com/2023/08/ford-f-150-lightning-tremor-possibly-spotted-for-first-time/