Lighthouse RV

I purchased a 2011 Lighthouse 18RB travel trailer new in 2011...I have had a couple of things go wrong with the unit , and need to replace a couple of things..I have taken the unit to 3 different RV dealers where I live now and they don't have parts to fit this unit...no one has even heard of a Lighthouse Rv..I called the dealer where I purchased it at in Nebraska when I lived there...and was told that they thought that the company Lighthouse RV went out of business....any one have any idea if this is true ?...The website for Lighthouse Rv is down...I need a new door lock unit..and every one that the 3 RV dealers I stopped at are different size...Each told me that they have never seen a outside lock style like mine has.