Sprinter-Source.com is a forum of Sprinter owners. Their site has far more Sprinter specific information than this site. Although virtually none of it is Sportsmobile related, it has a lot of information that can be of benefit to current and potential 4x4 Sprinter Sportsmobile owners.
There are particularly informative threads regarding Sprinter 4x4 tire recommendations, suspension upgrades, and skid plates, among other things.
NCV3 4x4 Talk - Sprinter-Forum
Mods, Please consider making this a sticky. There may be few replies to this, which would result in pushing it down where people will not see it. It is a valuable resource, however, and keeping it stickied near the top would make a lot of valuable information available to forum members. F-350 4x4s are going away, Sprinter 4x4 will become the primary Sportsmobile 4x4 vehicle, and the link offers a lot of needed information that our own site does not currently have.
Specific threads (all in the above forum):
Tires:
http://sprinter-source.com/forum/showthread.php?t=41802
http://sprinter-source.com/forum/showthread.php?t=44120
http://sprinter-source.com/forum/showthread.php?t=44399
http://sprinter-source.com/forum/showthread.php?t=44980
http://sprinter-source.com/forum/showthread.php?t=43204
Wheels (rims):
http://sprinter-source.com/forum/showthread.php?t=38775
http://sprinter-source.com/forum/showthread.php?t=44276
Suspension:
http://sprinter-source.com/forum/showthread.php?t=46557
http://sprinter-source.com/forum/showthread.php?t=39476
Winch mounting:
http://sprinter-source.com/forum/showthread.php?t=46568
Skid Plates:
http://sprinter-source.com/forum/showthread.php?t=42498
http://sprinter-source.com/forum/showthread.php?t=45326
http://sprinter-source.com/forum/showthread.php?t=45794
http://www.overlandsprinters.com
144" WB 4x4 vs. 170" WB 4x4:
http://sprinter-source.com/forum/showthread.php?t=45299
http://sprinter-source.com/forum/showthread.php?t=45046
http://sprinter-source.com/forum/showthread.php?t=44286
If you post in the Sprinter-Source.com forum, please post on Sportsmobileforum.com as well. We need to build our own database of Sprinter 4x4 information that is Sportsmobile related.