Does anyone in the U.S. make a tail rack like this or the Renntec. I don't seem to be having any luck finding one.

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I'm going to be designing, and building one for mine. Its gonna be all 6061 aluminum, and slide under the grab handles for mounting. I'll take pics when I'm done.

Go custom. I had a z1000 tail rack for my z750s that was a Givi. The sticker said rated for 16#s. I figured that my 25# backpack in the top box would be fine since no one was leaning against it. I was wrong the WELD broke. I am doing a full custom hopefully next month that includes side bags too. I had made custom saddlebag mounts (in the avitar) but the wife made me throw stuff out when cleaning out the garage. Since they had been off of the bike they were tossed. So bummed now. A bike without luggage sux.

Another option is a direct mount to the passenger seat. I have a Z1000 with an E370 Givi top box. I bought an aftermarket rear seat for $40 (CDN) on ebay and drilled four mounting holes into it, then fitted the Givi base to it with a couple shims up front under the seat to make it level. The bottom of the seat is a rigid plastic and offers a very secure mount. I've had it on since early last year and no problems, secure mount, even at 180km/hr!

Hi<
Good alternative is soft bag. Check link below:
Motorcycle tail bag (holdall) for Kawasaki Z750s

Motorcycle tail bag (holdall) for Kawasaki Z750s | eBay