Others lay exhausted in the open air, with only thin sheets of plastic to protect them from ground soggy from an intense evening shower.
Members of the illegal immigrant caravan chanted "si se pudo!" as they made their way north through Mexico Monday, having defied the will of one country and vowing to test the spine of another, the USA, very soon.
As a thousands-strong "caravan" of migrants makes its way towards the US' southern border, President Trump took to Twitter to threaten to cut off foreign aid to Central American governments and deploy the military to the border.
The three countries received a combined more than $500 million in funding from the U.S. in fiscal year 2017. Representatives for the White House and the US Border Patrol did not immediately reply to requests for comment.
Donald Trump has ordered the military to be on alert over a US-bound migrant caravan as he declared a national emergency.
Central American migrants walk along the highway near the border with Guatemala, as they continue their journey trying to reach the US, in Tapachula, Mexico Oct. 21, 2018.
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Many have left their homes for lots of different reasons, but it believed that some reasons could be violence and poverty in the countries where they live, and the hope of a better life elsewhere.
The caravan began in San Pedro Sula, a Honduran city known as one of the most violent places in the world. "We'll get a piece of plastic to cover ourselves if it rains again".
Migrants have received help along the way, receiving donated water, food, and clothing. Hundreds of locals driving pickups, vans and cargo trucks stopped to let them clamber aboard.
"He who leaves his town does not leave for pleasure but out of necessity", he said.
He said the migrants' rights must be protected as they break into Mexico and head north.
Even if many reach the southern USA border, it's unclear how many would attempt to cross at legal points of entry or be processed for asylum claims.
Trump had warned Mexico's government last week "in the strongest of terms", to halt the caravan's advance, and threatened to rip up a recently signed trade agreement with Mexico if Enrique Peña Nieto's government doesn't act to stop illegal immigration.