What if you burst an airspring, surely no reinflation devices would cure that? Personally, I intend to take 1x front and 1x rear air spring with me!
Also, how can you drive on 3 airsprings? I know you can in the old air-sprung Citroen's (Xantia's and the like, 3 wheels in fact!) but I didn't think the height sensors would allow for that on an RR...
Airspring explosion is very rare with recent ones. All the customers stories i heard were because of 10 years porous airsprings....Very often it was repairable by reseating the bladder on the upper mount...
One of my customers exploded one rear during an offroad session. Bladder was so bad, it was cut. Not repairable at least in France (because any tire shop in remote countries knows how to make a bodge on tires so on airsprings too as an emergency thing)
He had a inflation system and a 12 v compressor.
Took the relay timer under the LHD seat and over inflated the rear right spring that was still in good shape.
The way air suspension works (4 independant springs) makes it possible to lift and almost level the vehicle with only 3 airsprings
We did it on 30 miles to the next city.
Of course it bottomed while cornering on the broken side but on straight roads and highways it was very fine...It could have been even better if he didn't have oversize tyres.
What i want to demonstrate is if you have to choose between inflation system or spare airsprings alone, choose the inflation system.
Airsprings alone won't serve you anything at all if compressor is shot...and no other way to fill those. (except by the drier and then do the jumper method)
spare airsprings + valves are the BEST combo that i'll surely choose when going as remote as Mongolia... (2015 maybe)