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For that duty you are fine with the 8.3/Allison with modest power increases. The 920 with it’s walking beam suspension will not be a good choice for a camper.

The Cat 7155 comes with it’s own set of issues, it can handle huge power but is full of finicky o rings that fail and then you are broke down. Most people end up swapping in a Eaton/Fuller. I haven’t yet. Mine still works perfectly.

Search for posts by Simp5782 on the subject. He is the only one on here that put big power through the Allison and I can tell you it didn't go well. Hmm, 300K in a 931, your spine will need to be rebuilt before the 8.3.