If your 2021 Keystone Bullet Crossfire 1850RB is not pre-wired for a backup camera that means you'd be able to install basically any kit that comes with a mount like the Furrion part # FOS43TASF that you referenced. I really like the Furrion setups as they have the best reception and are very reliable so this would be what I would recommend.
If you prefer a larger monitor and want side cameras too the # FCE48TASL-05 would work great.
You could also go with the larger camera without the... view full answer...
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