I spoke to a guy who had done a camper conversion on a 130 and said he had alot of roll but fit thicker uprated anti roll bars from scorpion racing, can't remember if it was front & back or just the back but he said it was alot better than before.
You could double damper it, possibly back first then front if you like it. A wider track would be a good idea considering the extra height, i put 8x16 performance TX alloys on mine they have 1.5" more offset than the military wolf wheels and are rated at 1400kg each so added 3" extra track (not too keen on spacers) Also you could try some of those Air Helper springs that fit inside your rear springs enstead of the original steel helper springs.

Gaza