You can own your own truck, be it a regular pickup or one of the larger platforms, and still rent a trailer. Renting a truck trailer is more common than you think, especially with tractors. If you need such a device for moving a large device or something similar, you can rent or buy a semi-trailer.
They are ideal for mobile equipment that can hold the elements so they don't need to be closed. You can contact trailer builders to get one for your needs.
There are many types of trailers that can be rented or buy, such as: Deck trailers, which, as the name suggests, are more accessible. They are very popular for transporting vehicles of all types because the vehicles can be driven by one.
The lowboy trailer is another example of a rental trailer. As the name suggests, they are so low to the ground that they are easy to load but can also carry a lot of weight.
Another is the truck trailer, which stays true to its name. This is a trailer designed only for carrying dry cargo or equipment. Most often they have some kind of cladding or lining in them.
Don't be fooled by the word van as it is full size but inside is similar to what you would find in a van. This is great for loading soft items such as clothing and paper products.