100% covered with psoriasis head to toe, we use a 60gram tube of clobetasol. On just one treatment what else can we use that would last longer. HelpP?

If you truly have. That much body surface area involved, you should review with your treating physician other options for treatment of your psoriasis besides just topical options.
Psoriasis. There are many options to treat psoriasis, depending upon degree of severity. Check out http://www.mayoclinic.org/diseases-conditions/psoriasis/basics/treatment/con-20030838 & http://www.webmd.com/skin-problems-and-treatments/psoriasis/psoriasis-medications for options. Also check out http://www.drugs.com/mtm/clobetasol-topical.html for info re high potency steroids. Then chat w/your Dermatologist.
Yes. Severe psoriasis will not respond to topicals. There are numerous effective meds available including methotrexate and biologics. Have you seen a dermatologist?