I seem to recall where someone had glued (hot melt?) small, clear, corner protectors at the front of the shelf. I found this pic on Amazon, but home improvement stores may have them in stock.
Sherm & Terry w/rescues Steve (std Poodle) & Eydie (min Schnauzer)
2015 Jay Flight 27RLS (Camped: 102 nights 2015, 90 nights 2016)
2006 Ford F350 6.0 PSD, Lariat, 4WD, CC, LB, SRW, auto., Camper pkg.