Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Unable to use on a Travel Trailer Bumper

Beware - Just because the name says it's a 'Travel Trailer Bumper Mount' doesn't mean it will fit your Travel Trailer Bumper. There is only a 4" (3-15/16" at the top) gap between the mounting plates...if your Travel Trailer Bumper has an aluminum clad cover (making it 4-1/8" to 4-1/4"), this unit will not fit (and you will sending it back at your own shipping expense).