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Rhinos are a single chassis with many uses. IIRC the fluff from when they first appeared, they were tractor chassis, made to work in battle. When your support team is in a different system, you want a transport that can be kicked back into action.

Chimerae were designed to fit a purpose. Forge-worlds can churn them out by the ship-load, and they're as expendable as the troops they carry. The Techpriests and servitors can fix them up if they break.

If your lightly armoured transport is going to get left half-way up the field as you continue on foot, it doesn't have to be protected that well. This is the Rhino. It is to protect the tactical squad as it follows the vanguard that has cleared its way.
But, if you ride a Chimera into battle, trusting in its armour as you use the mounted gun arrays and turret before hiding behind it for cover, you'll want a tough front-end to help you get there.

 Furyou Miko wrote:
Exploration ATVs, not tractors. Do people just not read my posts?

Nope. Missed that one, after reading most of the posts above it.
See the "IIRC" at the start of the post. It also wasn't the main point in my post.
Yours makes more sense, though.