Beat me to it Ex-Dragoon. Here are some other links to the Enforcer and variants
http://www.amiinter.com/samples/netherlands/NL3301.html
http://www.naval-technology.com/projects/rotterdam/
http://www.naval-technology.com/projects/galicia/
http://www.naval-technology.com/projects/bay_class/
Here are some of the other runners that have been mentioned
http://www.naval-technology.com/projects/ocean/
http://www.naval-technology.com/projects/lpd17/
http://www.globalsecurity.org/military/world/europe/bpe.htm
http://www.globalsecurity.org/military/world/europe/mistral.htm
And at the other end of the spectrum, the non-military option - or floating warehouses
http://rusi.4t2depot.com/downloads/pub_rds/Carmel.pdf
http://www.navyleague.org/sea_power/jun_04_20.php
http://autospeed.drive.com.au/cms/A_1290/printArticle.html
http://www.americanshipper.com/paid/MAY01/how_much_bigger.asp
The ones in the middle are warships and have massive crew requirements
The ones at the bottom the civilian vessels with minimal crew requirements
The Enforcers can put to sea as transports with minimal crews - as in the case of the Brit LSD(A)s or as amphibs with a sea crew of about 60, a systems crew of about another 60 plus helidets plus up to 600 troops.
Off hand I would be inclined to think that the Enforcer is a good possibility. It would certainly make a good fit with a Schelde based design for the JSSs.
On the other hand - Maersk built warehouses from St. John's, Schelde designed JSSs fitted out at Davie and Kvaerner-Aker Ice-breakers at Washington Marine would spread the wealth.