I was also thinking maybe people did this often, and would know what kind of truck generally has the right axles. What about the installation?
In an XJ, you're looking at an axle width (WMS-WMS) of around 60-1/4" to 60-1/2". I wouldn't go any
narrower than that, since you'd have to have an awful lot of offset on the wheels.
Also, if you're going to go with full-size truck axles, it's almost a cinch that you're going to have a different lug pattern (IIRC, the XJ runs 5@4-1/2". Most full-size trucks run six or eight lugs, and any five-lug jobs are probably 5@5" or 5@5-1/2".) So, you may want to look into bringing the wheels along for the swap as well - and you're in good shape if you've got 15" or 16" wheels anyhow.
Oh - and the 9"/44 combo can also be scored from a U-100 Bronco (full-size,) if you have one of those. The 8.8" is also a decent axle, but it suffers from having C-clips. C-clip eliminator kits can be had relatively easily however - I'm sure that both Moser and Strange make them (as well as various upgrades.)
The early 1970's F-250 "Snow Fighter" package had, I think, D60/D60 axles - which is probably easier to find up there in Alaska than it is down here.
Me? I just want D44/D44, maybe 62" wide or so. A bit wider footprint, stronger axles than the D30/D35 I've got now (I'm refitting for a work truck, not a crawler/hauler, so I don't need to get silly...) and I'm used to the D44 axle anyhow. Which axle you select depends heavily on intended application...
No matter what axle you select, you're going to be looking at needing to replace bracketry anyhow - shock tabs and leaf pads 'round back, and spring buckts & suspension bracketry up front. The
only way to have a "bolt-in swap" would be if you got a D44 (available 1984-1988.0, with the tow package) rear from an XJ, or a Chrysler 8-1/4" (available 1991-2001) from an XJ. Even the MJ axle isn't a "bolt-in" swap, since the spring pads need to be moved (the XJ is "spring-over," while the MJ is "spring-under.")