Don't really have a link as they don't show the inexpensive stuff on their web site. It is a rubber or poly wipe. They have a whole section of them in Home Depot about 36 inches in length and only cost about $4 or $5 dollars. They have to be cut to the correct length and depth and then they have an adhesive backing that you just peel off and stick to the bottom of the door. If this does not hold up for a long time, I may try one that has to be screwed to the bottom of the door. So far, so good.
2010 Jayco Quest G2(SOLD)
2014 Jayco Eagle 33.5RETS
2007 Ram 2500 5.9L Cummins(SOLD)
2015 Ram 2500 6.7L Cummins 4WD