I've had slide-ins. They work fine except for 1 thing - they're too dang slick. On every stop or corner, the cargo goes sliding. I had to line it with plywood when hauling my llamas because they couldn't stand up. I was afraid of them getting hurt from falling into the stock rack.

“In a time of deceit telling the truth is a revolutionary act.”
― George Orwell

It's not over when you lose. It's over when you quit.