I decided I like the look of Marx scale tin on the "tall" trucks when pulled by my K-Line Marx 333 clone. Finally got around to fixing up a Marx tender and caboose to use with it.
The caboose was a 4 wheel 7" piece and the tender was a 4 wheel plastic piece. Both now run on 8 wheels held in Marx deluxe trucks. The earlier tin trucks would blend in better, but these are what I could find.