Join Date: Feb 2007
Location: Spain + Germany
My Motorhome: Four Winds RV
Thanked 577 Times in 535 Posts
Have a look at your waste trap under the sinks, you may have little vents going up from them (purpose unknown), we have one under the wash basin in the bathroom which caused a stink while driving. I blocked it and solved the problem.
RVs are different from motorhomes in many respects. You may do better for answers on an RV site, though there are a few of us here.
Brexiters. It's your sh1t now. Whatever happens nationally and internationally you own it. I wish you luck. I think you're going to need all you can get and then some. Friday 13th December 2019.