D-ring/tie down installation on an insulated garage floor

Sounds good.

I will load the bike today and have my wife rock it while I watch the backer plates. I'll adjust the nuts as needed. I am shopping now for aluminum to fabricate larger plates.

The Pit Bull plates are only a foot apart transmitting a higher localized stress to the insulation. These D-rings are significantly farther apart.

I'm toying with idea of mounting the E-track on the wall and using shoring bars. Commercial tranports use them to secure loads.