I've got this
Thetford smart toteLove that it has the hose already attached and it collapses back into the unit. Wheel it up to the side of the trailer, hook up the fitting, pull the handle. Nice little popup valve on top lets you know when/if it's full. Push in your handle and cap your hose and stow.
I back the truck up to it, drop the folding handle over the hitch ball and proceed to the dump station. 5mph unless I want to scare my feel camper with thoughts of 27 gallons of waste rolling though their campsite ;-)
I've had other totes but this one is less trouble, less messy and just worth the money to me.