I have a several old L-1011 sales brochures with takeoff charts, while these charts may or may not be correct I would think they are close.
For the -500 the chart shows a MTOW for a 6450 foot runway to be 428,500 lbs.
For a -1 the chart shows a MTOW of 380,000 lbs.
As I said these charts may be way off or spot on I don't know.
I do know we took an Air Transat -150 out of Lemwerder, Germany and the runway there is only 6234 feet (20 ft elevation). I don't know how much fuel we had on board, probably not much, but we made it to Stansted.