Short-cut is to get any scale looking body and mount them. BUT will not look and run like a scale truck.

You can buy separately an SCX chassis, a Scale Body of choice (Tamiya Hilux, Tundra, F350 body), make a steering servo mount, reconfigure steering linkages and upper lower links, 4-link mount, a set of 1.9 wheels and tires. Then do some detail work on the interior/exterior to give them the Super Scale. Do the math, some times it may be cheaper to sell your crawler and just buy the SCX-10 kit. It will be also easier to build.

OR get a scaler/tuber (.g. Wreckluse, Campbells, or Truggy) use the Tires, Tranny, and axles. You just need to set the length of shocks, upper and lower link mounts. Price of a tuber varies, depending on detail and mastery of execution. Be sure you got skills, tools, and interest as it is nit a kit form and will require some custom fitting. But getting it rolling on it's own will make you proud of yourself, for sure.

Example:

The Avalanche Engineering Sniper



Custom Made Chassis



then add in the axles, transmission, electronics and some scale details.

1.9 Scale Replica