Ah. A link through the above site provides carbon dates. However it is no wonder they are not often publicised and can threfore be dismissed:

http://www.tau.ac.il/humanities/archaeology/megiddo/chronology_intro.html

Quote:

"Radiocarbon (14C) Results

A relatively large number of short-lived samples (e.g., seeds and olive pits) from several sites involved in the tenth-century debate have been tested. The readings support the Low Chronology.

A series of short-lived samples from Stratum VIA at Megiddo?the city long believed to have prospered in the eleventh century BCE?gave dates that cluster decades later, in the tenth century BCE. Short-lived samples from other contemporary strata in the north also provided measurements which are "lower" than the conventional dating system.

Measurement of samples from several strata which represent the Megiddo VA-IVB horizon provided dates in the 9th century BCE; they are summarized in the table below:

14C dates for late Iron IIA strata in the north Site
Dates
Hazor IX
895-805/825-790
Rosh Zayit IIa
895-835/910-840
Rehov IV
877-840
Dor 8b in Area D2
890-820
Megiddo H-5 (a phase of VA-IVB)
900-805
1005-925
Aphek X-8
832-800

Results from Tel Rehov, which were conceived as supportive of the conventional dating, in fact back the Low Chronology. The last layer at Rehov characterized by Iron IIA pottery assemblage (Stratum IV) came to an end in a big fire. Samples from this stratum gave dates in the first half of the ninth century BCE. The contemporary layer at Megiddo?that is, the stratum which closes the Iron IIA sequence?is Stratum VA-IVB.

Conclusions

To sum-up, according to the Low Chronology, strata previously dated to the second half of the eleventh century BCE, such as Megiddo VIA and Beth-shean Upper VI, should be dated to the tenth century BCE (mainly its first half). And strata dated to the 10th century BCE and associated with the United Monarchy of King Solomon, such as Megiddo VA-IVB and Hazor X, should be down dated to the first half of the ninth century BCE and associated with the Omride Dynasty of the Northern Kingdom."