We just bought our first Isuzu box with a dove tail. This will be a standard dovetail and 5 foot ramp. We noticed the ramps were VERY steep. Then we attempted to load the 48 Walker. Long story short- the Walker will go up the ramp, but you have to disengage the deck locks(the deck will pivot into the upright mode). We called the metal fab shop,(they install over 100 a year). They said this is the first they had ever heard of this prob. Anyone else with a Walker experience this?