No ire from a 4Runner here
I have a friend that is towing a similar trailer, the FunFinder 244RBS; has pretty much the same specs. He's pulling with a Commander like mine. I think it is a lot of TT, but, I don't think it is too much trailer. One advantage that he and I have is the Commander's mass...very heavy at 3 tons and a little more power with the Hemi. You will be well within your specs, but, your lighter weight combined with your wheelbase will leave you more susceptible to side motion (trucks passing or a stiff wind coming off your side). A good weight distribution hitch with sway control (Equal-i-zer, Reese Dual Cam, etc.) will help mitigate some of that. 28' is a lot of trailer and I think that is about the max I would consider for your 4Runner without going up to a longer wheelbased vehicle, something in the 24-26' range would be better. One advantage to the Shadow Cruiser is that it is a "light weight" given its length. Easier on your engine, but, the light weight in that length also makes it a better "sail" pushing on your TV...you'll be lacking "mass" as a stabilizing force...