tail-spin CAN be a common occurrence when turning at speeds specially on a wet surface. I did that with my car...
The PPSI loading to the ground is what affects that one. Not so much the number of wheels.
(skip to the conclusion below to save time) And the 'vehicle CG' is important too.
So if you have a very small patch and heavy weight, then you can get tire scrub or also tire distortion, which feels a little like losing grip on dry ground.
Also noticed as over and under steering, depending on which end is 'feeling' it.
But if a very light weight and not much patch, then slip or float is a lot more the problem, which is what you had. Noticed as sliding. Again, could happen at either end, and depends very much on the PPSI loading vs the road adhesion.
Sooo, in my Taddy three wheeler, I had a little accident with front sliding on dry asphalt, one fine day (not me driving). Which is reason #1 that I turned to 2F1R-FWD designs. The rear (RWD-high PPSI) had some little amount of scubbing, but the the front (very low PPSI) had a lot more sliding that day. Good thing it was only at 25mph. Given a front slide, there would be no roll over possible, which is what I was trying to get a feel for (very carefully I may add). My CG was so very low, it had almost zero influance in this test event.
So a pick-up could have the scrub noted above when heavily loaded in a turn at speed, (oversteer)
and then have the slip noted above when no load is in the bed (again oversteer).
(depending on speed, turn and road conditions of course)
The actual tire pressure could also affect these, since it could change how much tire patch is on the road. Very often midengine cars have the front tire pressure lowered as a trimming adjustment. Or softer more grippy tread in front.
So understeering and oversteering (and spin-outs) are the accumilation of the scrubbing and the slipping at both ends of the vehicle.
One thing that happends is, the tire geometery in a turn, as weight shifts, and tire angles change. So this can get tricky in all three wheelers.
A tadpole in a turn at speed may loose some patch at the rear, rolling with the body, and that changes both the PPSI and the contact angle affecting both scrub and slip.
(if it slips much at the rear, it could level the vehicle out, but increase the turn, even occilate between slip and roll, or do that spin out)
(it it slips at the front, it can level out, but decrease turn radious, basically not making the intended line of the turn)
Plenty of 4 wheel vehicles have made mistakes in this tire-to-the-road-angle issue, as well as the PPSI engineering. Camber in bump and turn is a major issue in tuning race suspensions.
Conclusion: 3 wheels are only just a little more touchy about it. All vehicles are worse as CG is lifted up. So we keep that low as possible.