Well, when I got stuck in a grassy field without my recovery box in the bed.
If you're going to be in sloppy off road conditions, I would start thinking about off road tires, and possibly lockers. A grassy field shouldn't be that big an obstacle, even for a heavy truck if you have proper tires and have aired down.
We had to try to flop the truck out "Highlift style" with a borrowed floor jack. Couldn't get the truck high enough to clear the rut. Didn't look like stock downtravel was hurt much. I don't think these bags effect downtravel as much as I thought. Keep in mind, if you're really loaded, like a slide in camper, you don't want max downtravel anymore. A little less droop can make the truck safer.
It's been my experience that you always want max travel when on uneven terrain. The alternative on twisty ground, is running out of travel and lifting a tire. First, without lockers, this stops forward progress as you get one tire spinning and no traction. If that spinning tire comes down and suddenly gains traction, now you have a shock load. That breaks things. Second thing, even if you have lockers, to lift a wheel is to have the truck teeter and shift it's weight around. Better to have tires in contact with the ground. Sometimes a tire can be in the air, and when you cross that balance threshold, the truck will come down quickly. Even without a heavy load, this can lead to bad things.
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So far I haven't found anything practical enough to flex the truck to it's limits. I'll keep my eyes open. So far I have no worries like I did before about reduced travel. There was a nice casting sand hill to flex the truck on, but when I got to the top the truck dug in crushed the hill down to something a Subaru can cross. I installed the bags at nearly max length for best performance. I could shim/adjust them up for more down travel if needed. You can Remove the 4 u-bolts with an air wrench and the 2 top bag bolts with a combo wrench, un snap the air line, and the bags come right out for unloaded wheeling.
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That Daystar thing looks interesting. I might try those. Lets the bottom of the bag be loose for stock droop. I'll let others experiment with that first. LOL. Looks optimized for Firestone bags, not Airlift. One things for sure. If we try those, MAKE SURE YOU HAVE 0-10PSI ONLY in the bags before you test your flex. Air'd up bags let loose like that isn't likely a good thing. (says so about a dozen times in the instructions)
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If I do try the Daystar spacers, I'm going to add some plate steel to the bottom of my bags first so they're more like the Firestone bags.