how are you storing your water on board?
Sorry for the delay, had a death in the family and was offline for a while.
Not sure if I've posted pictures yet but I'll put some here now.
I installed two water tanks under the trailer and rigged up a pump system for filling the tanks and pumping to the shower. The two tanks total approx. 20 gallons. I also carry four 5 gallon jugs (two on each side of my truck box) and then three 7 gallon jugs at the back against the tailgate.
I've worked my load plan so that I get approx. 300 lbs of tongue weight for a loaded trailer. The gross of the trailer is hitting around 3500 lbs with all our gear minus bikes and kayaks. I can carry three bikes on the rack next to the tent as well as two kayaks on top of the load under the rack. So if I load ALL the toys then I expect to hit close to 4000 lbs gross on the trailer.
As described, the water load is around 60 gallons, or around 500 lbs (if I choose to carry that much water).
Our last trip I loaded up all the water just to see how the trailer pulled at that weight and it was fantastic. This trailer is made to carry best at or near the max gross as described by the manufacturer in a thread on here somewhere. The axle likes a heavy load, and I can attest to that as far as smoothing out the ride.
Unless I am going to be where water is scarce I will not likely carry a full load as described, but it's nice to be able to go out into the desert for an extended stay without fretting over the water supply.
So here are the two tanks mounted between the cross members of the under structure and flush against the bottom of the trailer bed. I have not bothered with a skid plate for the tanks as they are so high off the ground! I could never get the trailer over an obstacle high enough to hit a tank without taking out the under carriage of my truck. If I remember correctly the bottom of the axle with the stock tires mounted is around 19+ inches above ground and the tanks are well above the top of the axle.
Here's a closer look at the pump box. You'll see in the next picture that the box has two pumps in it. I had one on hand from my first shower setup (an ATV sprayer tank from Northern Tool) and decided to buy a second pump so that I have one for filling the tanks from water jugs and one for pumping the water to the shower.
You can see the layout inside the pump box here. You'll notice that the configuration of the quick disconnects was changed from my initial design to the final install. In the final all QD's are on one end. I designed the pump box so that I can pull the whole unit in just a few minutes and take the box into the shop if I need to work on them. Four QD's and six bolts will drop the box, easy as pie!