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fabr is correct........ on 1.25" od for a mini .095 wall in a good 1018 or 1020 dom is plenty and properly braced. in fact i would prob use .083 wall for the up and down bracing and .095 for the main frame members that carry shocks and engine cradle. make sure and spread the load well where motor mounts, shocks and suspension tabs are attached.
previously I used 1.125" OD tube... is 1.25" preferred?
Here's a link to a good description of the types of tube and briefly how made by people that know what they are selling.https://www.metalsupermarkets.com/difference-between-erw-dom-and-seamless-tube/