The three mounting points on the frame should all be on the same plane if the frames not tweaked. The stacked up height of the cross sill, cross sill bracket, and wood block should be the same as the rear sill mounting brackets for the bed to sit level. Some vendors are making cross sills taller than others and some have different height blocks. Just make sure you check the height of blocks-cross sill-bracket combination and it should be 4", same as the rear sill mounting bracket. Adjust the wood blocks accordingly. If you use the rubber pads, they should be placed at all bed mounting points.
Mar-Ktech
