I believe quad boss makes some specialized clamps for holding tools and etc. I would also look on some Jeep based vendors for items as well.
And, as stated above, some old fashioned, home-made brackets might be the best bet.
2015 super black Teryx 4 Kawasaki roof
2008 green Teryx LE 14" grey Moto Elixer wheels wrapped in Moto MTC tires - sold!
2001 red Kawasaki Bayou - sold!
2013 green Honda Rancher ES 4x4 custom sound system, 12" light bar, rear rack bag
1973 Chevrolet K5 Blazer 33" all terrains, 19 year work in progress!
1992 red Manco Machines 4 wheeler 5 HP Briggs and Stratton engine with cvt, 2 wheel drive, no suspension - sold!