Not sure on the Salem Kroger conversions, does anyone have any experience with these in general and specifically on a sprinter? Good enough to embrace or should I just quietly move along?
They are fairly serious conversions. The Salem-Kroger conversion adds a fair amount of lift to the Sprinter and it substantially changes the handling. My humble opinion is that you wouldn't want the conversion just to get out of the occasional bit of snow to save you from chaining up, as you'd be giving up some of what makes the Sprinter chassis a better choice for many people than an E-Series or the Savanna/Express. However, if your itinerary includes a good amount of somewhat technical "wheeling," it's perhaps the way to go. In any event, you absolutely will want to drive it before plunking down any money, as the handling may not suit you for trucking across America with a family.
Of course, there's an inherent conflict involved in serious trail work conducted in a 24 foot long, 8 foot wide, 11 foot high truck . . . but you already knew that.
If you're serious about it, be sure to look up the values of the plentiful number of used Navions (and the near-exact twin Winnebago View) using the RV Trader website or similar. This will show you the premium that you're paying for the Salem-Kroger conversion and you can decide whether it's worth it.
Are they still in business?
Nope, but Whitefeather Conversions:
http://whitefeather4x4conversions.com/
is the followup company, also based in Red Bluff and using basically the same technology. Here's a useful link to read about their conversion:
http://www.sprinter-rv.com/2011/05/20/4x4-sprinters-here-at-last/