These are a heavy duty STARTING battery NOT DEEP CYCLE. I suggest you stick with SLI31MDC’s . However the Crown equivalent is: Crown 31HDC130 - 12v - 130AH DEEP CYCLE Battery which should give you comparable service.
Sales people sometimes don’t realize the importance of proper application and want to sell what they have on the shelf.A starting battery will work for awhile but in the end the plates will warp and you will have premature failure.
Deep cycle batteries have heavier plates and other construction features , for heavy continuous draw down and long high amp charging cycles