I replaced both mine, each one at different times. Went with 6k axles. The axle supplier in KC only needed three measurements to build the correct axle. Last one I bought, Feb of 2018 was $384.00, that included shipping it to Florida. Croft Trailer in Kansas City, Mo. Great service. Several MOC members from our area have used their parts and services.
https://www.crofttrailer.com/