Hi Rusty,
I agree, I use Kadee #5s or a member of that family on AM products, generally without any modification. I did have to play with the GG1 a little and IIRC the Budd cars need a shim. Freights, heavyweights and streamlines all take the #5 without shims.
I'm not a fan of the 802 because of the space between coupled cars... it's just too big. Not to mention the cost compared to the #5s.
Tom Stoltz
in Maine