I have a 4 inch channel 2019 tandem trailer with a blown rear seal on the Vault hub of the rear axle. I can cross match the seal to replace it according to the chart from Dexter, but I don't know what size or capacity my axle is. The three likely choices would be 1.98 (1500-2500 lb), 2.33 (2900 to 4200 lb) or 2.56 (also 2900 to 4200 lbs). Once I know I can simply pick up the seal.