XP/2000 Domain & Peer to Peer Networking

Looking for advise and options when it comes to having XP Pro Laptops that are part of a Domain in the office, but also go out to clients with each other and need to network in a peer to peer envirionment. First if they log in to local computer they lose their setting they have when logging in to a domain because of different profiles. If they login to the domain using cache information they can’t find the domain controller to authenticate. Looking for the best solutions, from people they may have this same problem.

Thanks for any advise