I have an older Carson Toy Hauler. It is a big empty box with Kitchen bath in the very front.
It isn't like the newer models, no fueling stations, outside showers, etc. But, it is versatile, at times I carry my Samuari init, other times a 16 foot aluminum boat on its trailer, and some weekends we put a queen size bed in it. For elk hunting we build a visqueen hut on the loading ramp door and install a wood burning stove.
I love it.