Double Cardin joints are used in the front because the drive train tilts towards the rear, putting the transfer case pinion and the axle pinion both at an upward angle. That combined with the shorter length of the front drive-line (more severe angle) in a full time 4x4 would create vibration and lead to U-joint failure. In a part time 4x4, not so much, before the full time units became popular in the seventies most front drive-lines were single joint.
If your front doesn't bind and you run a part time case with locking hubs you probably wouldn't have any problems. Of course you also have to consider how the joints respond to full suspension droop, but that's true for any drive-line.
One other thing to consider is the shafts construction. You mention that it is thinner but heavier, this does not mean stronger. There is a reason that large trucks use large diameter drive-lines, they're stronger, even if the walls are thinner. The larger diameter makes them more ridged and less likely to twist under torque