The amount of weight transfer is typically adjustable on the better hitches. You can transfer as much as you want, however you should never transfer so much that your rear axle weight is too reduced. This will create a very dangerous sway situation. One thing to keep in mind with toy haulers, typically the weight is in the rear, even though this adds to the trailer weight, it actually reduces the tongue weight because it's pulling UP on the tongue. It's a large lever. This needs to be taken into account when dialing in the WDH. I suggest using a Sherline tongue scale to get an approximation of what you're dealing with, especially if the load or it's distribution changes. Once you think it's distributed well, take it to a CAT scale and get more accurate numbers.Also makes me wonder how much of the load is pushed forward to the front axle with a weight dist hitch ???