seemed like everyone I talked to didn't like the space they took up so I opted not to buy one. My 5er moves quite a bit without something under there and it drove me crazy. What I did was buy 2 ratcheting cargo bars like you would use in the bed of a pick up truck to keep stuff from moving. I put one on either side of the kingpin angled to the ground and give each a couple of cranks to tighten them up. Night and day difference and I think I have $40 in them. I bought a 3rd one and use it angled from the frame to one of the rear stabilizers and that helps too. I really should add a 2nd one back there but the way I do it now works just fine for me.
