Mark, It thought the 9600 gons had Andrews trucks as well-- so it looks like we were both wrong.
As to where the Friends might find some Bettendorf trucks for 9613, how about one of the sets of trucks freed up from the UTLX cars after the correct trucks come from Montana. I know a couple of sets are going under the Gramps cars, but there may be an extra set for 9613. If they are not quite right for 9613, then why not put them under 9615 as it is no longer the pipe gon it once was, then put the correct Bettendorfs from 9615 under 9613, which is still an historic pipe gon. Then take the Andrews trucks out from under 9613 and put them under 5995. Thus, all cars would have the correct trucks, except perhaps 9615, which is no longer original or historic anyway. Kind of like a case of "musical trucks"