I just bought a new Shurflo 12V pump to replace the older model in my TT. I'll rig up the old one with alligator clips to connect to the TT's battery so I can pump from the 6 gal. water container on the ground or my tailgate. I have the same dolly as sonic2. With a bad back I need to get inventive because holding that jug up to drain it into the water fill is not happening anymore!
Edit: If you are buying a water pump, make sure it's rated for potable water if the water is going anywhere near your mouth.
2011 Rockwood Signature Ultra Lite 8293SS, 12K Equal-i-zer
2016 Ford F-250 XLT SuperCrew, 6.2L, 4x4, 6'9" bed, 3.73
2010 Rockwood Roo 23SS (2012 - 2014)
2009 Ford F-150 XLT SuperCrew, 5.4L, 4x4, 5'6" bed (2012 - 2016)