Inquiry (采购产品): Stainless Steel Ladder Hi, First, i want to know the difference between a tilt&roll and the spring loaded casters. I also want the price for the following models: SSTR520 SS520 SSTR530 SS530 A5SH30-TR A5SH30 Could you also give me the dimension of the base on the top. I want to know the distributor here in Quebec province or in Canada. Thanks a lot Have a nice day Etienne **** Hidden Message ***** Etienne Boivin 3405-B Boulevard Wilfrid Hamel Quebec, QC G1P 2J3 CAN Company: Corporation HET Title: Mechanical Engineer Fax: (418)871-9329 E-mail: eboivin@corporationhet.com **** Hidden Message ***** eboivin@corporationhet.com