Looking for a Sprinter-based RV this fall

[MercFan]

Wife and I decided to buy a mid-sized RV, so we're looking for either a Class B (if we can sleep 3) or B+ Sprinter based RV. Here are some candidates:

Sprinter Diesel 2008 Vista Cruiser MB
2006 Winnebago View

Mileage and reliability are high on the list of desired features so I wanted to ask this forum for guidance. I've read elsewhere that Sprinters arrived in US in 2002 and that there are basically two models with the 'superior' T1N models being produced 2002 - 2006 (but that's just one article). The later models having more reliability issues (electronics, sensors, etc). Can this forum confirm this?!

I do make Bio Diesel myself (have a 50 gal processor) and plan on using it as an additive (20% -40% at most) so having an engine that tolerates it would be desirable.

I figured I'd look for something with about 50K miles on it that has maintenance history and looks well taken care of.

Here is an interesting one locally with custom 4x4 aftermarket package added on:
2007 Custom 4x4 Itasca Navion with 500w Solar

Does anyone know about the Salem-Kroger 4x4 system - the little info I found on expeditionportal was back from 2008 with little. The high lift does make me nervous about stability and maneuverability.