I had a post on expo about the mentality of heavy bulky gear & was chastised over it
I agree lightweight is better
I carry over a lot of my light weight hiking gear into overlanding
I agree that lightweight gear is always good to have. But there are some things that should NOT be "lightweight" by any means!! Hand tools, pry bars, Hi-Lifts... I would never even consider a lightweight version of such critical items. I will take the high density, high strength of a beefy steel tool anyday, over an aluminum or magnesium replacement that may buckle or even shatter under hard use.
Lightweight comes from a combination of multi-purpose gear, minimalism, and using lightweight options in places/equipment where it won't compromise the function.
Weight saving options that some people don't think about
-Fiberglass axe/shovels instead of wood or metal
-Synthetic clothing/camping gear over organics (debatable, quality wool definitely has its place!)
-Synthetic winch line instead of steel cable (this can easily save you 20 lbs)
-Filtration vs bottled water (where feasible)
-Dry food vs canned
-Adjustible/multi-size tools instead of full sets of every size
-DON'T PACK LAST MINUTE!! You're much more likely to bring a bunch of useless junk.
Here's a good list for ultralight hiking. Understandably, we tend to carry a LOT more on our rigs. But it makes a very good point. OUNCES EQUAL POUNDS. The more little bits of weight you shave off, the better!
http://www.hikelight.com/20201ultralightbackpackingtips.html