To the best of my knowledge, there is nothing of public record to provide the information you are loking for. I spent 41 years in the business and had experience with market data for 3 lift truck companies.
Data such as that is tracted by individual dealerships (not all do it) by account in their assigned territory to classify account A, B, C, D, etc.

Good Luck

The Industrial Truck Association (ITA) keeps tract of data reported by members ( most lift truck manufacters belong to, not all), they collect data wholesal orders/shipment and retail orders/shipments (as reported by their respective dealers). The data publishdc at the retail level is by state, county and SIC codes and is a total number reported by the members. From this data each member can determine market share at both wholes & retail. This data is collect for US, Canada and I believe Mexico now.