underdrive
jackwagon
They are all slide-in campers, just some have the floors reinforced so they can be bolted thru them to the truck bed. How exactly said reinforcement is done and what it consists of, that I don't know, but I bet FWC's Stan will! But all campers will have the perimeter anchor points (one in each corner) as not everyone is willing to punch holes on their beds for floor-mounting the camper, not to mention not all beds will have crossmembers in suitable locations for that - whether to use those perimeter anchor points or bolt thru the floor instead (assuming your model allows it) will be something for you to decide. But yes, that question may be best answered in the campers section, wait for Stan's answer first though, as it may or may not make the whole deliberation moot.