Upgraded land rover axles still aren't the best. You end up having to get the diffs pegged to stop the crown wheel being pushed of the pinion !!
Unimog axles weigh 450kg / 550kg?......... Each.....
Volvo c303 are a bit lighter. And most have disks.
But all these options are too heavy. Spend a bit on your Suzuki axles. Have lightweight simple axles with massive diff clearance over a 7/8 inch land rover or yota axle.
I suggest, Sami front axle. 26 sline side gears (or fit a rear diff). The new type 33spline cv end trail gear shafts and cvs. Truss it and gusset the swivel housings. Solid crush collar kit to stop it falling sort under heavy load. Fit high tensile drive flange bolts, use a 4.1 ring and pinion from a 413 as there the strongest.
Rear Sami, truss it, fully floating kit, hardened shafts, solid crush collar. For high tensile drive flange bolts. 4.1 ring and pinion.
Not to far different from mine but I run davidstow cheese 5.125 ring and pinions
