Here's a trailer attached showing the interference with the toolbox. On flat surfaces it's fine, but any kind of incline and the trailer gets into the box, especially when turning.
So I may have come up with a decent idea... What if I put the ESC and sound unit under the seat like this?
It'll be tight, but I may be able to squeeze both the speaker and battery under the hood. No external box and easy battery swaps, but I'm not a fan of the battery sitting so close to the motor and potentially getting hot.
I also have this speaker which is quite a bit smaller, but would likely require a box to be built. Nontheless, it would take up less room than the other speaker.
And if I did decide to build an external box for it, it could be much slimmer than the one I built before and it shouldn't interfere with trailer articulation.
