Bolt a few tires together and use that as weight on top of the drag. That is about the best thing to prepare a seedbed for clover. You may want to tie a small 1/4 inch poly rope between the atv and drag to act as a geartrain "fuse" when breaking new ground. To be easy on an ATV, I usually only run it in 2wd, it spins before straining anything too much. After any significant food plot work, i change the oil. The wet clutch slip and puts the material in the oil, causing your other parts in the motor and trans to wear out quicker.
If possible, when mowing before doing this. Mow high, then mow medium, then mow low. Cutting those branches and big stalk to smaller pieces really helps harrows not clog.
My favorite ATV implement is an old school spring harrow. Seems horses and ATV's in low gear jive real well in the power and speed range. Plucks out rocks well. Does ok at mixing in clover seed after seedbred prep.
One of the best tools on an ATV is the tires themselves. Run as is, or add and extra 2 or 3 psi to the tires and it cultipacks down great. Expecially the basic stock tires and not so much those real aggressive ones. Dragging those bolted tire and the wheels themselves works almost as good as a cultipacker.