I have a 78 roadmaster 22' tandem trailer and need a model # for Ins , I have no label anywhere on the railing. I do have the vin #

9 times out of 10, the trailer manufacturers called the trailers by the name of the boat model they were patterned for, for example my BradHaul 19' bubble decks trailer is a 19LPJ (19' low profile jet).

Tom, need help here!

You could probably call it a "22 Tandem" and would be fine (they normally only care about the GVWR).

thanks guys. I think I'll make one up like "22 tandem" or something, they just want to compare it to something up to date. 

Never had the pleasure of owning a factory new trailer, but do know to plan on between $3000 and $5000 for a nicer trailer, could probably do some shopping and get one for under $3000 but havent seen much around here...