Wheel Studs - do I need longer ones for alloys?

[gavinwibrow]

I'm converting my single axle electric brakes runabout trailer from Toyo 6 studs to Defender/D1/RRC 5 studs and fitting matching LR alloys.

I'm confused yet again - do I need the 60 mm studs (M16.5 x 1.5), or are the 45 mm long ones fine? From my measurements, it looks like the 45s will work (15mm thick drums, so about 30mm of thread), but might take a bit more effort to get the nuts started and biting into the stud threads?

I also guess also not all studs are equal, and on occasion I tow up to 2 tonnes, so want good'uns

Could do with some knowledgeable assistance pretty please.

Cheers

[Tombie]

Gavin. I don’t have the data at hand, it’s thread engagement that’s important.
Once you know that, you can make your decision.

[gavinwibrow]

Gavin. I don’t have the data at hand, it’s thread engagement that’s important.
Once you know that, you can make your decision.

Thanks Mike.
The way I measured, the first alloy nut initially just engages without centreing into the rim hole, and once started and centred, thereafter each nut engages and all tighten with about 25mm thread engagement.
I suspect if I were to use the 65mm versions, I could not fully tighten before the thread hit the end cap, but I'll go back and double check when I get the chance.

I did read somewhere that the differing "2 stage" design of the alloy nuts overcame the need for longer studs.