Common yes. Thats why mechanics use the vin # to order chassis parts.
The following will be state or local law contingent :
If you insure or register the rv using the chassis vin # , it might be to your benefit using the unladen chassis weight opposed to the gross coach weight, possibly offering lower rates for passenger plates etc.
This has been beneficial for many including myself. My experience has shown me that passenger plates are non commercial and can allow overnight parking in restricted areas plus much lower insurance premiums.
