Hi Bart
I suppose that one of the "cleverest" ways is to borrow a set of race car digital scales. Also check with the closest EAA chapters for anyone that might have a set....they're very accurate, BTW.
Auto parts stores generally know who is racing in the community....those scales read each individual wheel and the sum total...nice, as long as you're sure that the airplane is sitting level when you weigh.
Regards,