Hand-holding:
3 types of control

-----Follow Control (default): What it says, the cart follows the remote control. Walk around with the remote, throw it, whatever, and the cart will go to it.

-----Remote Control: Press 'Remote Control' button on remote, then pick up and hold remote and you will be in control of the cart from a stationary position. Put down the remote to stop controlling cart. Press 'Follow Control' button on remote to return to, you guessed it, Follow Control.

-----Ride Cart: Click the cart to get on and control it. Click the cart again to not do that and get off. If you fall out or it becomes unstable, move away from the cart or move the cart away from you to automatically stop controlling the cart.

Seriously...I'm usually an overly nice guy...but this is really, super simple and I honestly did not expect to have to explain it.

Some more hand-holding:

-----Hinted at above, but to be less subtle about it...it's a settlement thing. It will act strangely if you take it outside your settlement (or far away from where it was built). In a real world scenario, you wouldn't magically know how to build a toilet in the wasteland, let alone an advanced piece of technology such as this...so, even if you were capable of it, why in the world would you imagine it to work well?

-----Yes, if it sinks in water, it will be a pain in the butt to recover...why wouldn't it? Water is *good* for things such as this? I don't believe so, no. Lucky it even floats *sometimes* on the water, considering It's got huge, heavy machines attached to the bottom of it that would negate the buoyancy of the wooden upper parts. Even if it did float, it would not provide lift/find purchase on water. Does no one remember Back to the Future? Anywho, the remote floats, so that should help...'cause, you know, 'hand holding'.

-----If you seem to be stuck in control of the cart, don't freak out. Simply click the cart again or move the cart away from you, and everything will be fine.

-----Once more for good measure...if you travel too far with a cart it will eventually drop all your stuff, spawn again on its own a few feet away from where it was and you will need to throw your stuff back in it. It is purely meant for settlement use (and/or very short surrounding area of where it was built). Consider it a side-effect of having been built in the wasteland where absolutely nothing should work as well as you'd hope...and, also, I could have just removed that part altogether but left it in because I was feeling nice that day...in fact, could have straight blown the thing up on you if you traveled too far, which *I* would have enjoyed immensely. 'Whoopsy! Surprise, you dead!' ;-)