Ashley - You might try the reinvented Lincoln Highway Association http://www.lincolnhighwayassoc.org/ or the Route 66 Association http://www.national66.com/ for historical context information.  They are a source for reprinted travel guides of the era of your focus.  Members in State Chapters may have direct knowledge of professional archeological investigations in their own "back yards." 
As for archeological reports, there was at least one "stage stop" from the wagon era that extended into the Lincoln Highway period as a "road house" partially excavated in western White Pine County, Nevada as part of data recovery for the Level 3 fiber optic cable which was placed in the US 50 ROW in the late 1990s, early 2000s.  This gray literature report would be on file at BLM Offices in Nevada and Utah and might be obtained from Nevada Historic Preservation Division.  
Western Wyoming Community College has a web page on the archeology of a Motor Court on the Lincoln Highway at 
http://www.wwcc.cc.wy.us/wyo_hist/lincolnhighway.htm
As part of archeological inventory for the Old Spanish National Historic Trail in Utah, I have documented numerous broken leaf springs, windshield glass, busted split rim tires, head light lenses and other auto parts related to the Arrowhead Trail Highway.  In addition broken beverage bottles, meat tins, tobacco cans, a few horse shoes, condensed milk cans and other food, beverage, oil and fuel containers have been recorded in the "toss-throw zone."  Reports are in progress. 
Postcards of Motor Courts and Motels were a popular form of advertisement early on, and may yield useful architectural detail.  
Of course in the absence of additional bona fide archeological research on highway related sites from the 1920s to the 1960s I rely heavily on the analysis of David Macaulay in Motel of the Mysteries.  I will be interested in hearing what you come up with for comparative purposes. - Mark
 
Mark Henderson
Chupadero Archeological Resources, LLC
El Prado, New Mexico

---------- Original Message ----------

From: HISTORICAL ARCHAEOLOGY [mailto:[log in to unmask]] On Behalf Of
Ashley 
Morton
Sent: Thursday, August 12, 2010 11:00 AM
To: [log in to unmask]
Subject: emerging motoring/vacation culture in 20th c. help

Hello,

I  am working on a dump site that is related to a camp area in
California  that 
once had cabins, campgrounds, a roadside cafe and auto shop between  the
1920s 
and early 1960s. Can anyone offer resources (of particular  interest are
CRM 
reports) that might help interpret the material  culture? Those
resources 
regarding American motoring and vacation trends  would be especially
useful.

Thanks!