ON THE HIGHWAY, Oklahoma—The largest truck convoy in the United States has grown in size since departing California and is attracting thousands of supporters as it makes its way to the East Coast. The People’s Convoy started with around 150 vehicles and has grown to over 250 as it made its way through Texas and Oklahoma over the weekend. More vehicles have joined for stretches of time. That, along with the length of the convoy, makes it difficult to pinpoint exactly how many participants it has. “It varies. Let’s just say there are like 50 truckers that know the convoy is coming through and might have been going through this area. They’ll stop at an exit and they’ll wait for the convoy to come by, and then they’ll join it. They might join it for 200 miles or 100 miles, and then they keep going wherever they were going because they …