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Hey CJ,
A toy hauler that long will limit your options somewhat, but plenty of campgrounds can still accommodate rigs that size, especially private RV parks and campgrounds with larger pull-through sites.
When booking, look at the actual site length and, if possible, call before booking. A 45-foot trailer may fit on a 45- or 50-foot pad, but you still need room for your tow vehicle, slides, awning, and possibly the rear ramp or patio. If you want to stay hooked up overnight, you may need a much longer pull-through site.
State parks, national park campgrounds, and older campgrounds can be more challenging because many were designed when RVs were smaller. Newer private RV parks are generally easier to search because they often list individual site lengths online.
I’d also get the exact overall length and height of your setup and keep those numbers handy when making reservations. Ultimately, a quick phone call to the campground before booking can save a lot of trouble.