OP
there is, right now, a Hartland G scale (olive drab US army livery) tiny logging caboose on ebay (US) 36.00 plus 10.00 shipping.
this is about as perfect a caboose for chloe as you can get. IMHO, better than the LGB FRR caboose, because the length and height are better in proportion (yes i have both). The only change you might make is using an LGB wheel set instead of the slightly over sized HLW wheels (i do)
Id suggest, if a caboose is important you, do not miss this chance. A little spray paint and you're in business..