Some are inexpensive plastic stackable shelves; some are laminated modular shelf units; and some are merely boxes with a zippered or flip-front opening. Ford's stated reason was the greater difficulty of achieving acceptable rigidity in a structure with such a large opening at the rear, but the decision more likely reflected the fact that Americans no longer cared much for hatchbacks. A more significant change involved the Town & Country, which was no longer a wagon but a separate series of six- and eight-cylinder sedans and convertibles. Wheelbases were generally longer. Wheelbases were trimmed an inch for all '41 Chryslers save Crown Imperials. Thus, existing models -- save the ragtop T&C -- were sold through March 1949 at unchanged prices, though none of these "first-series" '49s were built in that calendar year. All prewar offerings returned save Crown Imperial sedans, and engines were slightly detuned. In 1946-48 Derham offered a Crown Imperial town limousine, as well as numerous one-offs such as a dual-cowl Imperial phaeton and a New Yorker coupe that resembled a Lincoln Continental with a Chrysler front end. Chrysler-based customs were still around in the late '40s, many built by Derham of Rosemont, Pennsylvania. Volume recovered from the 1934 low of some 36,000 to over 106,000 by 1937, only to drop by half for recession '38; still Chrysler remained ninth.