The load leveling shocks work at a specific length. By lifting you take them out of their set range and you lose the load leveling performance. Hook a trailer with a lot of tongue weight up to your lifted WK2 and the rear will sag, if it sags enough (down to its original height) the shocks will hold it from sagging more.
You can certainly tow like that if you want, don't think it hurts anything. Some may argue that the change in ride height affects vehicle dynamics and reduced load capacity/stability.. but the QL tow capacity is not derated for ORA levels.
You can fix the sag by lengthening the shock. Dunno if you will find a longer load leveling shock that fits. You could use air shocks or overloads if you find any that fits.
2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6, 2000 Grand Cherokee Laredo I6, 1979 CJ7 I6 Quadratrac