Unique Travel Trailer LiFePo Conversion – Compact Two-Layer Build

bottom of the fitting will be 1/2"-3/4" above the bottom of the tank meaning you can't get all of the water out
The one I most recently ordered has a square foot or so dropped 1/2” to minimize that. But theirs and several others do have that feature. I’ve put a few tanks in. 2x4 on one end and spray-foam under the gap. Minimizes residual but it also makes a air bubble preventing filling 100%