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Tried both options and would definitely go for upgraded springs and matched shockers.
King springs have a fair range springs to suit most purposes and can advise the best matched shockers.
Their phone in customer service people are great.
Sounds like your current springs are soft anyway - should not be sagging under the load you described
To fix your problem, I would change the springs.
If you are changing springs, then you have another choice to make ... do you want to keep the standard height, or do you want a little more clearance for off-road duties.
There are a lot of options, but possibly less for standard height packages, but you should be able to get something which will have better load carrying capacity.
If you want more clearance and better load carrying capacity, then look at 2 inch lift packages, of which there are numerous choices ( but I like Kings Springs and Koni Shocks ), and for comfort, if that is what you are after, I would go progressive rate coils.
Just back from 500km with car trailer on, back end dropped about 30mm with the car a little forward of centre, having read the thread on traction control problems with lifts, air bags for towing are looking good. Might wait until out of warranty.