For coordinated group exercise where all participants are completing an exercise movement simultaneously (where you need multiples of lighter dumbbells) – get a heavy duty rolling suitcase or rolling toolbox.
For semi-private training bring a pair of (quickly) adjustable dumbbells; there’s an assortment systems out there. Of course you’ll want to bring other training tools and accessories as well.
I like to have my clients “fight” over my equipment. For example, with 6 clients I pull out 5 tools. They have to race to the car and pick out their choice, or choice that’s left. The last person starts with a body weight exercise (after a group warm up, of course!). This is a lot of fun when training at a park or somewhere outside.
In fact, I don’t really understand why bother and carry them with me. Conduct training with clients on the territory of the hotel, there are specialized, if you search on https://planetofhotels.com/en/ and specify the necessary criteria. For if you travel long distances, then it can be very stressful, and so – many hotel complexes are waiting for equipment