What little I read, there is very little difference between the spring rates, if anything the tow package "beefing up" was for better roll rate and handling when towing, NOT counteracting sag from the tongue weight. BUT, I could be wrong.
A lot of Chrysler Vehicles had an option for "Load Leveling" Shocks, NOT sure if they came with the Commander, they were an option on the Mini-Vans. I think they are sold aftermarket as well.
Load Leveler shocks have extra equipment internally, valving that uses the pumping action of the shock, if the shock is compressed below the reference height, to increase pressure and extend it back to its reference height. I.E. if you load up the back of the vehicle and the back end sags, after a mile or two of driving the shocks pump up to return it back to stock ride height.
Its kinda like an air shock, except automatic and you don't have to add air to get it back to stock ride height. Of course, unlike air shocks that can be used to adjust to any custom height, the load levelers have one height only. If they weren't available OEM over the dealer counter, I think they are available aftermarket.
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