I don't have a Sabre, but shower should have an access panel in front bottom. I only used mine once, and it flexed. Several threads on beefing up; one I remember was using spray foam inside garbage bag under shower so foam didn't get around all the lines and drains. Several people also beefed up with wood. You may need to see how yours is laid out underneath before deciding.
Good luck and let us know how it goes.
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Mitch in MN
2018 Patriot (Grey Wolf) 23MK travel trailer
2011 Durango 5.7L and OEM tow package
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