marginal receivers?

In contemplating taking delivery of our 3023 in March, it occured to me that, power deficiencies as well as short wheelbase aside, there may be a greater problem with my TV:

My TV is rated at 5000 lbs towable, but has a receiver rated at only 500 lbs. If my 3023 with all the options, packed for a trip, will weight-in at, say, 4000 lbs, then the ideal hitch weight at 15% of trailer weight comes to 600 lbs.

I occurs to me that a WDH adds little safety in this regard since the weight on the ball is actually not reduced. In fact, the WDH actually adds stresses to the receiver by adding higher forces of torc to the receiver's welds, bolts, and sections as the load on the ball is, in part, transfered from the rear springs to the front springs of the TV.

Does anyone have information regarding the loading margins for hitches (or incidental reports of receiver failure)? Given TM's claim that their units can be towed by "mid-sized" SUVs and minivans, I wonder how many softly-sprung TVs are running around with WDHs and ball weights exceeding the receiver manufactures' maximum.

Thanks in advance.....