Here's another tool box option with drawers 1900 x 500 x 510mm.
Ligedy's 17.56-2 OB
I have the extended draw bar so no issues with hitting at 1900mm wide.
Pros - love the drawers, very easy to get at gear from when setup. don't need to lean over draw bar or tilt up bend end to get at things. After the baby Q is removed and camp setup, the draw is used for storing scooters and toys given it is easily accessible.
Cons - drawers add a little extra weight and reduces available storage capacity. Lid not needed as I don't used it (would have been better off without the lid to gain the extra 50-60mm in available storage height). Biggest box I could fit... means I tend to fill it adding to the tow ball weight...