As mentioned above Rimstyle’s website is great for window shopping, especially if you want fully load rated rims and tyres.
I like a lowered van (mine is close to 100mm and will be going lower) but it’s a very personal thing. A bit like having a stock height van with 20” wheels which to me just looks odd.
Practical, no fuss options are stock 18” sport line alloys, 18” Amarok steels and 17” GP steels. All load rated and able to take properly load rated tyres. If you want to spice it up a bit then 19” Amarok Cantera alloys look the business but are in quite high demand at the moment and will cost a chunk more.