belongsToMany with Eloquent model as pivot table

Hi,

I'll give an example (not real use case, I made it simplier) to explain my problem. I have 3 tables and 3 models:

User Model
- Id
- Name
- Country

Room Model
- Id
- Capacity
- Level

Booking Model
- Id
- User_id
- Room_id
- Arrival_date
- Departure_date
- etc

For the relations :

One User hasMany Booking
One Room hasMany Booking
One Booking belongsTo a User
One Booking belongsTo a Room

I want to be able from a User to get all the rooms he booked in ($user->rooms) and from a Room all the users that booked it $room->users. I can't use hasManyThrough because I don't have the user_id in the Room for example. Also I think I can use belongsToMany In my User and Room models but Booking is not only a pivot table, it's a normal Eloquent model where I have accessors, other relations, functions, etc. I'm a little stuck, if you have any ideas to create this relations ? I'm on L5.4

Thanks