Hey DavidHarvy22
My pump has been burping occasionally, and I was hoping it may just be a speck of dirt that may work thru but after your problem with the back fitting I thought I had better have a plan, just in case. My RT is a 99 -190 Versatile and the water heater is on the other side of the van but I still have the same type of connection right tight to the wall under the stove. After a lot of crawling around under the van with a flashlight I finally found that the tubing runs on the outside of the frame but is covered by a black fiber panel which appears to be removable by removing the LR wheel thus allowing access to that fitting. If that doesn't work I guess i can always use your plan "B".
Bob