Most likely the supports broke loose, and the tank disconnected from the drain pipe. Two or three medium ratchet straps could make a temporary fix to get the tank back in a usable position. Reconnecting the pipe will depend on just how it came apart. If the pipe simply pulled out of a rubber grommet on the side of the tank, smear a little soap on it and work it back in as you raise the tank. If a coupling broke, a rubber repair coupling may be the answer. An Ace, True Value, Home Depot, etc., should have everything needed.
Dutch
2001 GBM Landau 34' Class A
F53 chassis, Triton V10, TST TPMS
Bigfoot Automatic Leveling System
2011 Toyota RAV4 4WD/Remco pump
ReadyBrute Elite tow bar/Blue Ox baseplate