I think you'll find the better part of the Egyptian truck park of the era was made up of Zil-151s and Zil-157s including their MRL platforms (BM-11, BM-13 etc). To that end a Studebaker makes a decent enough proxy, although you could convert the ICM versions. So sad that the old Airfix SA-2 Guideline moulds were lost. They had a Zil-151 as the missile tractor.
Good looking project. I take it you are aware that Wargames Foundry made a dedicated range in 20mm? I had their WW2 figures and they are nice sculpts.
Thanks, I did find the foundry figs a little late, but I have picked up 60 of them to do
Cheers
Matt