plumbing

How tight are you making them? Seems to me there is a reason? Either your not getting them tight enough or something???

I replaced all my faucets in my older Fleetwood and never had a problem, the Winnebago leaked from day one and the dealer claimed to have tightened them also.

Usually faucets in RV's are made by pheonix. First time they leak replace them with one from a hard ware store. I usually replace them with moen. Look the same but last forever.

Don't connect them direct I had problems with mine till I replaced the direct connections with the braided faucet hoses.

Replace the fitting that you just tightened. Probably just get a new faucet while you have the fittings loose. Nothing very special just get what you need at Lowe's etc.

I plumbed my trailer from the tank to all the faucets. I used PEX pipe, brass full flow valves before the supply lines, braided stainless supply lines to everything. I rebuilt the 44 year old faucets with new washers. I've found that plumbing is one spot where saving money is not efficient. If I have a leak and have to come back to it later, any money saved is blown away.