Hi HoosierLife,
I guess that’s one way to choose between a thicker and a thinner mattress
I would be cautious about choosing this with an all latex mattress and I would confirm that the distance between the slats was suitable (3" or less) and that the frame and slats were strong enough for the mattress and the people that are sleeping on it and that there was no flex in the slats. It certainly wouldn’t be my first choice for an all latex mattress. I would be particularly concerned with the gap between the slats in the middle. There is more about the different types of support systems that are most suitable for different types of mattresses (including latex) in the foundation post here.
When you can’t test a mattress in person then the most reliable source of guidance is always a more detailed conversation with a knowledgeable and experienced retailer or manufacturer that has your best interests at heart and who can help “talk you through” the specifics of their mattresses and the options they have available that may be the best “match” for you based on the information you provide them, any local testing you have done or mattresses you have slept on and liked that they are familiar with, and the “averages” of other customers that are similar to you. They will know more about “matching” their specific mattress designs to different body types, sleeping positions, and preferences (or to other mattresses that they are familiar with) than anyone else.
Phoenix