Recently, EDR posted:

The only single-engine piston aircraft that I can think of that Piper
has put a door on each side of the fuselage is the Tomahawk.

How about the Pacer / Tri Pacer?

Except for the addition of a couple wing ribs for wing walk area and a
door frame, are there any structural reasons why a pilot side door
could not be added?

There would have to be a considerable amount of fuselage stiffening added
to the pilot side. That would add quite a bit of weight, reducing the
useful load and performance.

Now that Piper has gone to the overhead panel, the
left sidewall is clear of any "controls". (Is the fuel selector still
there? It could be relocated to the center console as it is on the
Saratoga.)

The fuel selector is under the dash area, ahead of where a door cutout
would be. I don't think that's the big problem that's kept Piper away from
dual doors.

Neil