I know it will vary from region to region State the state and practice to practice, but what are the ballpark fees for doing such a transfer?

I am sure the formula varies by region.  

Drive around a bit as well - there's still a lot of regional players in billboards if one is operating in your market chances are you'll do better with them. 

-"commercial" local/regional tiny house builders will offer some financing option or another, find someone local in your price bracket and work with their financing-park models can be financed through dealers/(etc), and small ~400 or 600 sq ft singlewides, although getting spendy, perhaps, could look attractive once you factor in the negative of anything smaller being tough or impossible to conventionally loan down the line.

Bonneville CountyAverage Purchase Price: $380,000Average Rental Price (3-bed home): $1,700/monthKey Highlights:Home to Idaho Falls, a regional economic hub.Diverse economy with strong healthcare, education, and energy sectors.Steady population growth and increasing rental demand.5.

Does anyone have experience with this method, within this region?  

If you are open to moving close by your future investment property, I would start by deciding on states\regions that you are comfortable moving to. 

I currently have four doors in Northern CA region.

@Angelo ProtoSome of the top vacation markets I hear about often are:-Pocono Mountains of Pennsylvania-Catskills and upstate NY-Tennessee - Gatlinburg and Pigeon Forge-Shenandoah Virginia-Blue Mountain region of Georgia-Many Florida marketsIf proximity to home are important, the top two may be of benefit to you.

There are many 30-year options for this with nationwide or even Texas regional lenders