I'd recommend McGard Wheel installation Kit designed for long term use. They are guaranteed for life and are the recognized leader in aftermarket lug nuts. There are many nuts cheaper but these stand the test of time. A set for four, 6-lug wheels runs about $40-45 USD depending on where you purchase them. The kit comes complete with everything necessary including the 'key' to unlock the locking lug for each wheel. (Kit # 84630 covers four, 6-lug wheels with a thread size of 1/2"x20tpi.)
Make sure the studs you purchase are designed as wheel studs, not simply 1/2"x20 studs.
Old trucks and old trailers . . . a comfortable combination!
A-6E All Weather Attack Driver, BUFF
USN Aircraft Maintenance Officer, Ret.
'91 Suburban R-2500 w/BBC
'78 Honda GL-1000
'72 Triumph T-100R Daytona