The key to success on this is a wider stance and a lower CG. Most of the CG lowering ideas end up decreasing suspension travel and ride height. This is not always a good thing for off road bashing.
As for widening your stance, you can accomplish this in several ways that can be taken one at a time for a little width or cumulative for a lot of width.
First, the ProLine WideMaxx a-arms or the RPM equivalent will add a total of one inch in width (1/2 inch per side).
Next, are RPM StableMaxx rims or ProLine wide offset rims. These also add a 1/2 inch per side.
Finally, wider tires like the ProLine 40 series or IMEX JumboMaxx tires which give a much larger footprint than stock and add approximately 1 inch per side in width.
Taken all together you can get upwards of 2 inches per side in extra width for your old style stock Maxx.
This wider stance will make the truck more stable in turns and decrease the likelihood of rollovers.
If you decrease the ride height on top of the wider stance, you will make the truck virtually roll proof.
As I am not a big believer in sway bars, I will not comment on their effectiveness.