The type II (series 4408) would be a "best" compromise because there are probably more Bettendorf trucks around. The cars had wooden frames so there wouldn't be a need for the SUF hardware. the only big problem I can think of would be the cast Bettendorf body bolster. On the otherhand the ASF trucks on the type I coals (series 4246) are only 5 inches longer then the ubiquitous D&RG 3'7" trucks and had a similar side frame. Again the big trouble would be the ASF cast body bolster. The Rigid trucks would be the most difficult to come by since so far as anyone knows there is only one modified pair in existance. The St. Charles coals (series 4000) to which these trucks belong was also a bit more complicated in construction. Naturally the most structurally sound and perhaps easiest to maintain were the SUF cars built in Aug. 1910 (series 4498). Also there are erection drawings for the Type II and Type III (SUF)and plenty of photo evidence to make clear how they were modified in the late teens so that they could esthetically run with Nine in her (more or less) 1937 - 1939 configuration. BTW there were no St. Charles type coals left in operation in 1937.
Does anyone know why 1006 has not been aquired by the CHS?
Derrell