Being part of a caravan is really a dumb thing to do if you really wish to disappear into the US from south of the border. It puts you in the bullseye.
Being a native south Texan, and being in a Spanish congregation for 3 years, I've heard many stories, first hand, about paying the coyote, floating across the Rio Grande, camping in the Texas wilderness and and meeting up with the coyote associates at a convenient store to be driven to San Antonio, Dallas, or Houston. A nice tall wall will only take a ladder and rope, easier to defeat than the Rio Grande
A huge group at the border, especially with the current administration makes NO sense.
I say we do a big hands across America conga line and force the caravan to go on through to Canada. Let them be Simon's problem.