An educated guess is better than no information. Scaled from a photo, the roll cage on the SRK is about 1.36 inch (35 mm) diameter steel tubing. Steel absorbs a lot of energy in a crash, by bending rather than shattering. A car typically has steel reinforcement in the door to serve the same purpose. If the SOLO has just a fiberglass shell, it would provide very little protection. If it has some serious structural members designed to absorb energy, it could be pretty good.
As to spinning out on slippery surfaces, this probably has to do with rear wheel drive. But I wouldn't worry about it too much. I can drive it to keep the rear wheel force low, and let off the throttle if it starts to slide. Sometimes the ability to spin out can be an advantage. Like one time, in a small rear wheel drive car (Simca Aronde), I went down a hill that was so slick I just slid faster and faster. At the bottom was a T intersection. I spun the car sideways and it stayed on the road.
As to spinning out on slippery surfaces, this probably has to do with rear wheel drive. But I wouldn't worry about it too much. I can drive it to keep the rear wheel force low, and let off the throttle if it starts to slide. Sometimes the ability to spin out can be an advantage. Like one time, in a small rear wheel drive car (Simca Aronde), I went down a hill that was so slick I just slid faster and faster. At the bottom was a T intersection. I spun the car sideways and it stayed on the road.
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