First, you're cfm ratio is backwards, If the fan pulls air faster than the filter rating, the scrubbing of the funk is compromised. Air must be in contact with the carbon long enough to be effective.
If you're expecting this duo to cool as well as clean the air, I say go bigger! When I had a 10x10 room, I started with a can33 and a 6in fan. I was running 2400W and the room stayed around 85*, way too hot. I switched to a 8in Vortex fan (745 cfm) and a Mountain Air filter. I actually had to slow down the fan, it was too cool!(73*). While this setup is overkill for you, I strongly suggest you shoot for 1 full air exchange every 2-3 minutes, 1 min. is better. A 6in. Vortex may fit the bill. Also check if the fan can be speed controlled, some Canfans can't be slowed down. Speedster brand fan controllers are about $25 anywhere on the net.
As for weight, I sure you could rig some sort of cradle supported by 1in. pvc or something similar running up the sides of the tent.
For best Vortex prices on the net: plantlightinghydroponics.com. I've bought several fans here and they're 30% below anyone else. Also, the Mountain Air filters last about 3 years, Can filters, about 1 year. Seems well worth the 40% difference in price.
Hope this helps,
Fred