Your trailer is an "aluminum skinned RV with a wood frame" so there are some differences in how a slide awning can be mounted. You won't be able to use the skin and butyl putty tape as a means of mounting the awning rail to the side of the trailer as you could with a smooth side fiberglass (FILON) trailer. You'll also be mounting the awning rail into wood rather than aluminum.
For those two reasons, you'll need to find suitable framing under the aluminum skin on your trailer and you'll need to be very careful to seal all entry holes/screw holes from water intrusion.
Take a look at your trailer sidewall and you will see screws in the vertical frame members that hold the aluminum skin in place. Feel between those vertical members for a HORIZONTAL frame support where the slide awning rail will be attached. If there is no "included support already built into the trailer frame to support the awning rail, you may find that the trailer will not support the installation of an awning rail (horizontally).... Unlike a fiberglass trailer where there is enough "skin strength" to support an awning rail, unfortunately, 0.028 aluminum siding does not have the strength to support an awning rail, so you must have a "backer to support the rail"....
If your trailer has such a backer above the slide, then you should be OK. If it doesn't have a backer to mount the awning rail, you will probably have issues after installation with the awning rail coming loose from the trailer skin.....
I can't tell you whether Keystone is building Hideout trailers with an awning rail backer over the slides or not.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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