Mike,
I think this is the link Dick was referring to.
Steve
http://beaveramb.org/forum/index.php/topic,4671.msg35462.html#msg35462
With all due respect, this link is to a 2015 post by Dick Simonis. The post above in this thread was posted in 2013, therefore, it couldn't have been referring to this post.
In fact, it was because I also couldn't locate the link for Dick's post that I found the link I provided above. Regardless of whose instructions you use for transferring the wires from one thermostat to another, it's worth noting that the thermostats used by Dick in 2013 were representative of those available at that time. All of those were designed to run on 24V and contained batteries for backup. Although they were successfully used by many people for RV applications, in fact, they were being run off of their backup batteries since RVs couldn't deliver the necessary 24V.
The Honeywell thermostats I specified above have the distinct advantage of not having a 24V requirement. They are designed to be powered solely by two AA batteries. Therefore, using these in an RV application is fully consistent with their design use. IMHO it's always better to use a device in a manner consistent with its design rather than having to adapt one.