For anybody who might still be interested:

The RK2 ori is dependent on trfA of which there exists a Ts version. It is utilized in some of the recombineering plasmids created by the Don Court lab and the sequence can be obtained from https://redrecombineering.ncifcrf.gov/strains--plasmids.html.

Data on curing efficiency is provided in A set of recombineering plasmids for gram-negative bacteria by Datta et al 2006 (http://www.sciencedirect.com/science/article/pii/S0378111906002927)

this is also available in a Cas9 vector from Addgene: https://www.addgene.org/92054/