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hippy
Speed is not a factor. Rider weight is a neglible factor since in dominates system weight. Position is technically a factor but for practical solo safety cycles only beach cruisers and Dutch bikes might have sufficiently rear-shifted weight balance to make enough difference, and even then I'm not sure. Slope has an effect, but only going uphill makes skid more likely, and who's hitting the brakes hard going up hill? Very sudden application of the brake can cause a skid in a situation where steady state braking would cause a stoppie, because it brings moment of inertia about the tipping axis much more into the equation, but even then a stoppie is the more likely outcome in most cases.
Essentially, for most classes of solo safety cycle, the tipping limit is about 0.6g deceleration, while the grip limit on dry clean tarmac is about 1.0g, so you need a big geometry shift or very compromised grip to slide the front in a straight line.