finally took some pictures of the "completed" project. i say "completed" bc i will inevitably make changes and modifications as i see fit. but for now it does what i intended it to!
all the materials i used i had laying around. i will probably replace the square steel tubing with square aluminum stock at some point.... or not i dunno.
i can move the base in half inch increments, if i need it somewhere in the middle i can move the backstop. the line scribed on top of the base is the centerline of the dummy axle to make for easy setup. the whole concept of this rack was based around the dimensions from this post: