Any Landlords on here? Student accommodation.

[dickturpin]

My DD has the chance of sharing a flat for her college days and we are being told we need to sign as guarantor for her. That's fine. What worries me is the terms 'joint and several' in the tenancy agreement. That means if any of the three occupants fail to keep up with the rent we can be liable for it all. The estate agency says that all the tenancies are done this way!
Happy (ish) to be guarantor for DD but for others as well?
Suggestions please.... :grumble