Lee, what did you mean when you wrote "No wheel spacers, they are the devil."??? Just curious.
So this is sort of the short answer (but longer than just random name calling).
The wheel spacer adds a level of complexity that leads to problems down stream.
The nuts holding the spacer on (for the normal better designed ones) are hidden and if they lose torque are not easily checked or tightened.
The materials used for wheel spacers are problematic - aluminum is the minimum worth considering (avoid the plastic or urethane ones).
But even aluminum may not handle the contact stress of the mounting bolts or the wheel.
This leads to torque loss over time.
(and this is the reason lock tite is not a fool proof solution for the nuts mounting the spacer to the hub)
There are plenty of stories out there, I saw one on this forum where some one lost a wheel on a paved road.
I'm sure if there are any chassis design technical experts out there they would agree with me.
Apart from that, one of the beauties of the P500 is the 50" width for trails with width restrictions.
I know that in many location people are able to cheat the width some.
My life goal is to to haul my P500 west to ride, just life hasn't let me do that since 2018 for one reason or another.
Ohio is not ATV/SxS friendly.
Rocking up to a gate that is really 50" wide would suck with spacers on.
And on the flip side I am not a believer that the P500 is "too" tippy (If my P500 has ever been on its side (or roof one time) I'm sure there is another explanation for it).
I think the designers did damn good job on the P500.