[Matt Austin]

Thanks very much, Ryan. They show exactly what I'm looking for in relation to the fixed-side vehicles. The attached pic shows a similar setup on my own truck, with four horizontal boards and an upright made from channel. (discounting the farmer's added angle and tube.)

I'm wondering, also, if there's photographic evidence of GS trucks with dropsides, or were dropsides restricted to specific non-GS types?

The hunt continues, and I'm grateful for people's contributions.

Cheers,
Matt