I have a 276RLIS which should have the same distance between the landing gear. I ran into the same thing when I was installing my strong arms last year.
I'll be over at the storage lot this weekend and can measure it for you if nobody else responds.
Another suggestion is to email Heritage Glen and ask them. That's what I did since I hadn't picked up my trailer yet when I was ordering the strong arms. They replied the same day.
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2019 Chevy 3500 SRW LWB 4X4
Sandpiper 3550FL
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