"Try" on the van.I’ll try thanks
"DO" on the testing. Or rehome them.
If the first doesn't work, the only thing risked is your birds. (and its a BIG risk to them).
If the second isn't done, you risk the flocks of every State you cross along the way. Ask the people in Arizona or Utah how they felt about euthanizing their flocks after someone in CA decided to take birds out of State w/o testing, or the commercial producers who destroyed millions of birds after vND/END spread from a backyard flock to theirs.