Back two years ago going to FL, I was pulling a 2008 Montana Copper Canyo 5vrn and was rear ended on the passenger side of the trailer while waiting at the Delaware Memorial Bridge toll house. We were stopped. The damage was a little bit more than yours. At the time, I thought it would probably cost around $3000.00. To make a long story short, the adjuster totaled the trailer. He said that the impact moved the entire right side of the rig about 1" forward and the slide wasn't working the way it should. While inspecting, he got up to $24,000.00 and stopped. He said it was totaled. I'm glad he did that because I was afraid of what it would have looked like after repairs and if there would have been any long turn effect.
Be sure you look at everything including tanks, electrical, mechanical slides. Take it for a ride. Fill ALL your tanks and check for leaks. Pressurize your water system and check for leaks. Don't be surprised if they total it. You start adding up a possible new rear cap, ladder, decals, compartment door and compartment. You may be shocked. Keep us informed please. Thanks.