Vinyl: relatively cheap, flexible, sound-absorbing, moisture-resistant, underfloor heating is possible and maintenance-friendly. You can buy one roll of vinyl which means that it leaves no seams on the floor and provides a nice look. In addition, vinyl is especially useful in wet areas such as a bathroom, as it is highly resistant to water. However, make sure you only place it on a flat subfloor.
PVC: has almost the same aspects as vinyl. Flexible, sound-absorbing, moisture-resistant, underfloor heating possible and maintenance-friendly. However, PVC is more robust with the effect that it lasts longer. It also means it’s less user-friendly.
Laminate: Again, the same key elements as vinyl and PVC. Relatively cheap, easy to maintain, scratch and stain resistant, easy to combine with underfloor heating. Laminate is easier to install. However, it needs a sound-absorbing subfloor because the material is stiffer and gives more noise.
Natural products: wood, carpet, etc. These products are usually more difficult to assemble and maintain.
Walls / ceiling
Many people use wooden slats for their walls or ceiling.
In smaller vans, carpet/felt is also a popular choice to use, as it can be applied directly against the metal, creating the most living space. In addition, it is easy to apply.