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.
+! On this comment. The plastic ones are slicker than snot and if you get a drip of oil on them, figure that you will bust your arse, also the ones that are corrugated, are a pain to sweep out.
Bottom line is they are tough and will save your bed and walls. That is about the only thing I have good to save about them.
