XZLs are tires for military vehicles and are not made in a lot of different sizes. In 16" they come in 7.50R16 and I think 235/85R16 labelled as "OR 4X4"; you must order these sizes from Europe. These are 32", suitable for unmodified small 4X4s. 8.25R16 XZL is available in the US and is 34" tall. They will fit on dually setups for 235s without rubbing and have a 3200 lb load rating single. They aren't cheap.
There's also a XPS Traction in 235/85R16 which also has an all steel casing and is sold all over the US. Maybe that's what you should look into. They are about 50% more expensive than 235s with polyester casings, but I believe you get what you pay for.
The next size up in XZL is 255/100R16, which is 36.4" tall, 10" wide and would require a lift for most small 4X4s and re-gearing. Then there's 11.00R16 (38.7" tall) and then all the 20s: 275/80R20 (37"), 335/80R20 (40.7"), etc.
Charlie