I'm not aware of military (this should be pointed as other systems just uses civilian trucks) truck purchase from another countryThose trucks look low maint./quality which is good cuz their only use is to act as transport/load carrying. So yea they're probably built in house.
Edit 1: Those TEL's might have imported tech/equipment tho. Would be surprised if they were home made also.
They don't resemble with Russia's TEL or China's HQ TELs
To be honest they look like a little like Patriot's TEL
If anyone knows the Arman truck name it would be appreciated