I have the Equal-i-zer 10k lb kit on my 2021 19BH, did not need to relocate anything. All measured out within spec.
Regarding the 10k lb purchase. Their tech support said to get the 6k lb kit but that the 10k kit would be just fine as well. Having had their 4k kit, I did not want to do this purchase again and opted for the 10k kit. Has worked great and to the point that I would not tow without it.
Don't exactly have a closer photo but here is my setup with the 19BH and WDH.