I think there will be a few types interested in it, and the category you mention is certainly one (and I agree about the sorta Countach vibe).
Another category will be those that can make use of its distinct features–the most important one being the roll-down bed cover. I’m thinking contractors specifically. They get tools and equipment stolen out of their trucks all the time. There are lockable toolboxes and such available, and tonneau covers–but it’s going to be hard to beat a motorized system that covers the entire bed, and to a greater height on the cab side of the bed.
Another feature is the air suspension, which will allow raising/lowering the whole truck, and putting it into a kneeling position for easier loading.
The F-150 Lightning has a 5.5-foot bed; the Rivian 4.5-foot, and the Cybertruck 6.5-foot. They’re all roughly the same length and have similar cabs; the Cybertruck just uses the length for more bed instead of more hood. People who want an electric truck and need max bed length will want a Cybertruck.
Cost, I think, will ultimately favor the Cybertruck. Tesla has proven much better than the competition at reducing costs. The gigacastings are a big part of it, but their battery pack design is about the most efficient out there and they have the most tightly integrated heating/cooling systems. And, well, they don’t spend a lot of money on buttons 
. So people who care only about specs and cost, and don’t care at all about looks, should be interested.
I think there will be at least a few truck drivers who aren’t necessarily looking to turn heads, but do like the idea of driving an absurd behemoth of a vehicle. I mean, look at the current crop of standard ICE trucks–they’re grotesque, like those bodybuilders that inject stuff into their muscles. Their bulk has nothing to do with practicality, but the buyers seem to like that. Probably most will still be put off by the shape, but I think a non-trivial fraction will like the brutalist aspect. It’s also, uh, partially Tommy-gun proof:
While both Ford and Rivian are going to get access to the Supercharger network, that’s still a couple of years off and even when it arrives for them, it’s likely to be not quite as seamless, at least at first. Part of what makes it work so well for Tesla is the billing system and the in-car software, and competitors will have to match that. In the meantime, Tesla will have an advantage.
I think those and more add up to a reasonable market. The top 3 vehicles in the US are all trucks, and capturing even a small part–or even expanding it to non-traditional truck people–is still a pretty good business.
