load balance uplinks

I have a problem setting up uplink load balancing, i followed lartc
instructions and set up this

P0_NET="10.10.1.0/24"
P1_NET="10.10.2.0/24"
P2_NET="10.10.3.0/24"

IF1=eth0
IF2=eth2
IF0=eth1

IP1="10.10.2.1"
IP2="10.10.3.1"

P1="10.10.2.2"
P2="10.10.3.2"

ip route add $P1_NET dev $IF1 src $IP1 table T1
ip route add default via $P1 table T1
ip route add $P2_NET dev $IF2 src $IP2 table T2
ip route add default via $P2 table T2

ip route add $P1_NET dev $IF1 src $IP1
ip route add $P2_NET dev $IF2 src $IP2

ip route add default via $P1

ip rule add from $IP1 table T1
ip rule add from $IP2 table T2

ip route add $P0_NET dev $IF0 table T1
ip route add $P2_NET dev $IF2 table T1
ip route add 127.0.0.0/8 dev lo table T1
ip route add $P0_NET dev $IF0 table T2
ip route add $P1_NET dev $IF1 table T2
ip route add 127.0.0.0/8 dev lo table T2

ip route add default scope global nexthop via $P1 dev $IF1 weight 1 nexthop
via $P2 dev $IF2 weight 1

10.10.2.2 and 10.10.3.2 are both NAT boxes. The problem is that, route set
in "ip route add default scope global nexthop via $P1 dev $IF1 weight 1
nexthop via $P2 dev $IF2 weight 1
" command as last will always be used. if i switch the order the other one
will be used.

this is my main rt:

~# ip route
10.10.2.0/24 dev eth0 proto kernel scope link src 10.10.2.1
10.10.3.0/24 dev eth2 proto kernel scope link src 10.10.3.1
10.10.1.0/24 dev eth1 proto kernel scope link src 10.10.1.21
default
nexthop via 10.10.2.2 dev eth0 weight 1
nexthop via 10.10.3.2 dev eth2 weight 1


if the active route goes down, no route will be used.

tHanks