upper support bracket 12 where the third gusset 46 is attached to the second flat web 40 and the second lower flange 42 a fourth gusset 52 is attached to the fourth edge 48 of the first upper support bracket 12 where the fourth gusset 52 is attached to the second flat web 40 and the second lower flange 42 the third and fourth gusset 46 52 provide structural support for the first upper support bracket 12 the first upper support bracket 12 is attached to the tank or van assembly 2 and is mounted directly above the first bottom support bracket 14 the first upper support bracket 12 is positioned to allow the second flat web 40 to bear against the truck chassis frame rail 18 the second lower flange 42 of the first upper support bracket 12 has at least 2 holes a first hole 54 and a second hole 56 defined therein the upper flange 20 of the first bottom support bracket 14 has a third hole 58 and a fourth hole 60 defined therein where the first hole 54 and the third hole 58 are oriented in line and the second hole 56 and the fourth hole 60 are oriented in line a bolt assembly 62 is installed the first and third hole 54 58 and the second and fourth hole 56 60 the bolt assembly 62 comprises a bolt 64 a first washer 66 a second washer 68 a spring.