I am in the process of making a 4' square trailer to hold a 60-65 gallon sprayer, folding 12' boom and foam marking system to show where I sprayed. Adjustable height tongue to fit 2 different pieces of equipment. 2"x2"x3/16" Sq. Tubing. sealed welds - no openings for liquid to get inside tubing to freeze or create rust. No suspension, golf cart tires. I had to shorten the axle 16".
Then I'm retrofitting propane tank holding brackets for a fork lift to hold O2 tanks on the haul trailer.
I modified 8 AR500 1/2" thick steel targets, converting them from solid flat facing targets to targets that are now angled at 30° and movable so they move when hit. Different animal shaped targets was teh biggest PITA. The rectangular shaped targets were easy. They vary in height from 6" off the ground to 50".