Could the smaller HO water cars could be used for the transhipment from farm dock to pickling plant,
with the larger On30 cars standing in for the haul-away cars of processed pickles??
If you line your tanks with cling wrap and hide a steel washer under the top layer of pickles,
and pour in undiluted PVA glue and then top up with pickles,
then perhaps you could have removable pickle loads?
I've seen the technique used for coal loads so I can't see why it wouldn't work for pickles.
Food for some additional thought?
Unanderra in oz