Man your on this pronto. Those wheels should weather up great because you could make Lincolns head disappear in those treads. (Little inside mechanics trick)
right the trailer is done there is just the chains to add and the a few odd bits, so ive primed it and painted the wooden area of the trailer a good bit it it will get the worn treatment where tanks and cars would be carried
the wood is painted with panzer aces old wood and stained with raw umder oil, ill let this sit for a few more days and seal it before i paint it