RSI Smartcap and iKamper on 2020 TRD Sport DCLB 4x4?

Hello

I have been searching for the answer to the best way to mount a cap + iKamper, with in stock items. Long story short - I am taking a cross country trip this Summer w my son to visit elderly relatives and looking to camp along the way. I am experienced in RVing and backcountry camping, and looking to have the comfort of a mattress w the convenience not hauling a trailer.

I cannot find the setup on tacomaworld which I can purchase this Summer - RSI Smartcap + iKamper Skycamp 2.0 (not the mini). I am looking for easy install, lowest cost available. I am not looking at a rack bc I need my gear covered from rain.

AT Overland is a bit too expensive and not available until fall, other options like Alu-Fab are too expensive.

And help ?
Thanks in advance