Why would you not bother after all that excellent advice. :

If you follow it then there wont be any problems, and you could've charged top dollar for having the know how.
There the sort of jobs you want, that others turn away, it turns you from being just a carpet cleaner into a proffesional.
We clean quite of few of these type rugs and if you do a good job there excellent for repeat business. we find people have there rugs cleaned more often than fitted carpets, probably because they get taken away and cleaned and brought back like new and its no hassle to them at all!
i would think seriously before you trun away a job like this, they would be customer for life.
regards
steve