You get a bit of information about socket options with pfiles, for example
93: S_IFSOCK mode:0666 dev:344,0 ino:48867 uid:0 gid:0 size:0
O_RDWR|O_NONBLOCK
SOCK_STREAM
SO_KEEPALIVE,SO_LINGER(0),SO_SNDBUF(1048576),SO_RCVBUF(1063400),IP_NEXTHOP(0.16.57.232)
sockname: AF_INET 192.168.42.33 port: 34793
peername: AF_INET 192.168.42.33 port: 5602
But how can I read the traffic class?