This is a question I have been pondering too... and have still not decided the answer too for our build. I've been bogged a few times. The first was for several days in Black Cotton Soil in Tanzania. Trees were a plenty and a rear mounted winch would have been very handy as it would have saved 4 days digging... The second was coming out of a beach camp in Mozambique on a sandy incline. Sand ladders and organized use off were all that needed.
What I do know is that on a 10+ tonne truck an electric winch is not really an option. It'd have to be huge and need a lot of batteries to be half way reliable! If you do seriously look at winches, look to hydraulic as it is controllable, powerful and continual. Also look to rear mounting. I sold my crane, but purposefully kept the hydraulic PTO unit on the gearbox. That way I have the option to buy a large hydraulic Runva Winch, mount it in between the rear chassis rails and use it to pull myself back out from whence I came. I however am leaning towards the no winch camp as it's more unnecessary weight being carried for occasional use.
Whilst on the subject of recovery, one thing I will be carrying is a decent 2 leg chain soley for recovery. When you get recovered, make sure you always attach to both chassis rails and not just one (using a 2 leg chain), as ladder chassis's don't like being pulled hard on one rail. 2 recovery eyes (painted yellow) on the front and rear of each chassis rail is a must. They make great securing points for shippers too.