I have a 2012 3750FL and I had the same problem. The ground in front of the storage unit where I keep the RV has a steep angle. I didn't even know I was scraping the bottom of the RV pulling in and out until one day I noticed gouges in the asphalt in front of my storage unit. I looked at the bottom of my camper and found that the support bars on the bottom of the receiver tubes, on the hitch that was installed by the previous owner, were gouging the ground. I am lucky the hitch was there to take the hit other wise I could have done a lot of damage to my rear cap and ladder.
I immediately had skid wheels welded to the bottom of the hitch assy. on both ends. The back of the RV now only clears the ground by an inch or two when the skid wheels make contact.
Here's a link to etrailer. They have good info and videos on skid wheels. Click the tabs at the top for product pictures, videos and FAQ's.
https://www.etrailer.com/s.aspx?qry=skid+wheels
Check Amazon for the prices.