Before you permanently weld the tank frame in make sure your's didn't have four little tabs welded to the main frame that the two angle iron supports actually BOLTED to, first. The purpose of this was so that the black tank can be DROPPED out the bottom of the trailer (for service/maintenance) without much trouble. Well, a lot less trouble than cutting a welded frame out would be, ya? You'd just take out four bolts/nuts and the two angle iron tank supports would drop out after bellypan removal. just a heads up
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fotochop