If you assume a max load of 41 and you start 10% below max that would be 36.9. Max load of 41 - 43 seems like a large spread.
I have a 6.5 x 47 as well. I have not tried RL 17 but would be interested in the results.
If you would like, PM me and we can swap contact information. I can run this combination in QuickLoad for you as well, if that would help.