Then I hung it from the floor, close to the axle so the weight difference between empty and full would have less effect on the tongue weight. I used a pump to pull the water from the tank and send it to the faucet:
The pump automatically turns on when you open the faucet and turns off when you close it. I put a switch in the electrical feed so I can turn it off when I drain the tank, because running it dry will burn it out. The sprayer seemed like a good idea but it tends to splash water everywhere. I'm not putting one in the next trailer. The water inlet is just a collection of tubing and fittings I got from HD.
Bruce
The placement looks perfect. 
You might want to put some sort of skid plating over the tank to protect it from any road hazards. You can probably find something off a junkyard jeep that would fit just fine. Take it from an old biker 
, stuff kicked up at highway speeds can do some real damage!
