Help with selecting WD hitch capacity for a travel trailer

If you are talking about a genuine Equal-i-zer hitch, the bars are specific to the weight class and are not interchangable with heavier or lighter weight class hitch heads. If you have 1000lb bars and want a heavier or lighter one, you need to purchase a whole new hitch.

This is generally not the case with most other brands of hitches.
Barney