RV's may be able to climb fast but when it's hot enough to use AC, keeping the engine cool can be a problem. We have been down in the heat (100*+), throttled back to keep the oil and CHT's out of the red, and been able to climb at only 100-200 fpm.
There's also airspace concerns (at least out here on the left coast), that prohibits climbing to cooler temps. So sure, RV's may be able to climb fast, but AC can provide passenger relief when it's hot and you're down low or on the ground. You have to decide if it's worth the effort and weight penalty.
If I were building my -10 I would install it without blinking.
-Marc