I was deliberating the same thing when I was thinking about the design of my drum, and although its not actually made yet, Ive opted to go for the fixed axle too.
I bought bearings for it with the intention of mounting them in the bulkheads, but I liked the fact that having a fixed axle would add more strength overall.
In terms of maintenance its also probably easier to replace a shaft thats fixed to the chassis than it would be if the shaft was fixed to the drum



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