I learned on the big stuff, myself.
Forklift driver in a Mobile home plant, slap a sticker (wood spacers to allow forks in) across the forks behind the hitch, then park it.
I did need spotters for I'm right up against the ball, and 12' wide, 40' long.
They wanted them double wides close, to keep the carpet & furniture, laid loose inside, safe & secured
Hardest to back up are short, one axle trailers, like for jet skis, they turn quick, easy to get crossed up.
Tandem wheels are steadier, track straighter, more effort to turn.