Tie down options for step side truck - need advice

I have set like I pictured for 30 years.
It was often used when I work in heavy machinery. Even now can rest for 2 years but when it is needed, it really helps.
Like the hitch mount I did for Honda 3000 last year. I can slide it into receiver with generator attached, but doing final 1/8" adjustment without such a tool can take forever.