Can't find anything USA-made, but here's
another one on Amazon that works well for the Skymaster when out airplane-camping or at fields with no services. This ladder fits snugly when centered and upright against the back wall of the cabin. I wedge it there with baggage and it's just tall enough for me (5'10") to reach & dip the fuel filler caps & rear engine oil cap (but NOT tall enough to see into them).