32 might also be just the working gears, so 16 forward, 16 back?
The bigger 1700 axles have a bigger oil reservoir in the portals so you should never get the oil migration issue some have had on the smaller axles. Search here for info on that and you'll see there is a fix anyhow.
Overall gearing would be down to that mog though, it may have a fast axle ratio it may not. The optional gearbox overdrive (a switch on the gear lever) takes you above 8th so you can sit at slightly higher speed or travel with less revs, the working and crawler gear sets (levers coming up through the floor) allow you to go slowly or is-it-actually-moving slowly. Either way it won't be fast, top speed or getting there.
I believe a 1700 is about 500kg (?) heavier as bare chassis than a 1300l but can carry 3 or 4 tons more. Bigger brakes too, and a turbo from Merc as standard so more hp. 395 tyres a factory option. A 1300l may give a softer ride though if you drove both back to back weighing say 8tons?
If you are really only going to put an Alaskan on the back than weight wise a 1300l will be fine. If you end up with bigger tyres, two spares, lots of fuel, lots of water, tools, spares, etc etc would you rather a 1300l heading towards its gross limit or a 1700 with plenty to spare? I would think the steel bodied ambulance will eat into your payload a fair bit too compared to an Alaskan?
A nice choice to make
It'll be a fair bit further up on four legs to get in too