I had more room in our Class C than you do, but IMO, it's more important to be able to winterize easily, than worry about the strainer. In other words, if you need the space, take the strainer out; because that Camco kit makes winterizing a piece of cake!
"Winterizing easily" became a deal-breaker for us: we were seriously looking at buying a small Class C last winter, and when we discovered how difficult it would be to access the pump equipment in many brands of RVs (Thor was THE WORST), we just gave up. And making this much-needed process difficult is stupid, since at least half of the USA needs to winterize their RVs
