What is the best tote size for Traimanor

We have a 97 3023 the dump values are close to the ground .
What size Tote will fit lower to the ground so gravity will work.
We have seen the one built for pop ups but the wheels were so small that it looked hard to handle.
We camp at Florida State parks and the dumps are usualy a good distance from the sites .We need to pull the tote behind the truck.
I have not used the tote and have only seen the tote as it stands at Camping world .
We have a 10 day trip coming up and would like advise as to the type and size of tote we need and if there are special way to rig for clean flow from the valve to the tank.
Thanks
Ricknjoy
2005 Tundra v6
97 3023