Yes, second DHCP is recomonded for redundancy at remote site.
Check below links for configuration:
1. Need Clarification on Setting up Second DHCP Server for Redundancy
http://forums.techarena.in/windows-server-help/699273.htm2. How to setup DHCP redundancy (50/50) on Windows 2008
http://www.howtonetworking.com/server/w2008dhcp7.htm