Get creative with it.
For "in-the-truck-tool-kit", it doesn't have to be top of the line, built to last type of tools. It just has to get the job done, once.
Make your own specialty sockets out of pipe or tubeing. Weighs much less than the store bought socket - and works well enough to do the job - in the field.
In my lil' part of the world, I regularly work on "odd-balls" (I.E. - something other than G.M.) and have, over the years, collected quite a number of home-made tools and sockets. Built multiple sockets out of various sizes of exhaust pipe tubeing. Most of them are double-sided (two sockets in one) and weight no-more than a 6" piece of tubeing.
Other sockets/ratchets:
Ditch the over-lapping sockets. A complete set of 3/8ths sockets, and whatever you know you might need that isn't covered in the 3/8s set. Two addapters (3/8ths to 1/2 and 3/8ths to 1/4). Three lengths of 3/8s extensions. A good, long handled, swivel head 3/8ths ratchet. A short handled 3/8ths "nut-runner". A 1/2 breaker-bar.
That should cover just about 90% of anything you will need "in-the field" - as far a sockets/ratchets go.
Some other ideas:
Double sided open-end wrenches, insted of a complete set of box-end wrenches.
Modify the high-lift jack handle to axcept a 1/2 socket.
Stander-ize your truck before hand. Convert, as much as is resonable, to standered sizes.
Forget about being comfortable, focus on getting the job done.
