245/45/20 tyre pressures?

Hi all .... I have recently purchased a T6.1 that has Accelera 245/45 ZR20 103Y XL tyres. I have had an issue with the TPM coming on periodically. Because they are not factory fitted I'm not sure of the best psi to be running them at - for everyday use, no real load. I've read the maximum for the tyre is 42psi?
Any advice would be appreciated.
 
I have them on the front and run them at 40psi. Mine is a 4Mo so heavier than some at the front. I know others run them at 36/38. Depends on what model of van you have.
 
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