sla with source route

I wanted to do a double wan with a source route with an sla or similar

i want a certain IP to use a certain outbound connection unless that
connection is down at which time i want it to use a different
connection

I was looking into doing this with a source route tied to SLA,
something like any from hostA next hop wan1 track blahhh

but wasnt sure on the specifics? should i policy match on a route? and
then track on that route with sla? or other?

this is just something spinning in my head, im going to do a mock test
in a day or so but wanted to ask if anyone has done something like
this. in this case the policy route is needed as normal traffic will
go out a different connection and the specific ip/traffic that will be
source routed

thank you
Lawrence