LeadSled
It's odd how the memory plays tricks on one - I would also have said, from memory, that the L1011 had a higher x-wind limit. Just dug out the Big Airways/Callie F.M. and the only reference to x-wind limits appears in the A/P engaged to 50' RH limits, which gives "reported wind not greater than 26kts, x-wind component not greater than 20 kts, tailwind not greater than 10 kts and no abnormal turbulence". For Tristar x-wind operation the forward slip was, of course, the ONLY way to do it and the other relevant entry in the F.M. is in the section on x-wind landings ...
"Touchdown on one main landing gear is permissible and recommended"