I only have Snake-Eyes and Storm Shadow of the 25th variety and I have been able to get Snake Eyes into some regular vehicles.

I have not yet taken pictures of him or Stormy in them, but I was thinking of taking a few to recreate the idea of their joint assault on Cobra Island back in issues 46-47. I pasted some YoJOE links to the vehicles that can accomodate 25th Snake Eyes.

ASP http://www.yojoe.com/vehicles/84/asp/
Stellar Stilletto http://www.yojoe.com/vehicles/88/stellarstiletto/
IMP http://www.yojoe.com/vehicles/88/imp/
Thunderwing http://www.yojoe.com/vehicles/04/thunderwingjet/

Most of these favor "full length" poses or "slouching" instead of "sitting" which is the key issue with the 25th. But then again, how many of us could drive a vehicle with our legs locked at the knee and stetched all the way forward (a la old school vehicles and figures)?

Anyway, just rambling and sharing ideas since we don't have vehicles for them....YET!