Two boxes load balance squid

[Mr_JinX]

Hi,

I'm looking to get two Pfsense boxes and have them load balance Squid with SquidGuard if possible?

I have looked into multi-wan but this doesn't seem to be what i'm looking for?, i did take a look at CARP and virtual IP but not sure if that's the way to go.

Can anyone provide any advise on how or weither its even possible, I'm trying to get two boxes so that if one falls over there will be minimal loss of service.

Please