You shouldn't have any issues with the cargo in the garage causing sway. The water will probably help your tongue weight, depending on where your freshwater tank is located. If all else fails, take it for a ride loaded up, see if you have a sway issue, and reload accordingly.
2015 XLR Hyperlite 30HFS5 (mods being performed regularly)
2009 Salem LA 292fkds (gone)
Nights- ('12)23 ('13)23 ('14)15 ('15)31 ('16)25
2014 Harley Davidson FLHX (XLR cargo)
2014 VW Jetta TDI (diesel sipper, camping support vehicle)
2011 Ram 2500 CC 4X4 CTD, B&W Companion (toy hauler hauler)