Quick Blazer tank install question.

[69SCSS]

I installed my tank where I thought it should go, everything lined up perfect and if fit great, until I dropped the bed on the frame this weekend. The 3rd bed support back hits the top of the tank and the filler neck! Do you have to trim that support to fit the tank? Unless I turn the whole tank around and move it as far back as I can, I don't see how this is supposed to fit. Anyone have any pics from underside? My filler neck points straight at the hole for the bed mount on that support.

Any thoughts? Every picture I've seen as I've done a search shows me I have the tank mounted correctly. My bed is shortened, but it looks like the support is in the correct place.