Well, lets try this. Please confirm your camper is a 1999 T2553. This is a front kitchen, mid pass through bath with a rear bedroom.
The fresh tank, it is under the bed in the back? This means the water pump is in the back of the camper.
Since this issue does this on city water, have you tried testing the issue when using the pump and the fresh tank? That would be a big find regardless how it comes out and could lead to the next steps in troubleshooting. Especially if the water pump works normal and city water has low flow.
- Also where on the camper is the city water inlet? Is it in the bedroom wall, the bathroom wall or up front by the kitchen?
- Also where are the low point drain valves in relation to the bath faucet, shower and kitchen faucet and the city water inlet?
- And confirm the hot water heater is under the bed or in the cabinet next to the bed?
I'm trying to figure out any possibility in the piping of the camper to cause this but need to know a little on the piping layout.
Here is another thing to ring out, while you pulled the screen out of the kitchen faucet, did you pull out the entire aerator plastic fitting up inside the faucet above the screen? Basically all the way back to the piping in the faucet head leaving nothing left inside but the open pipe. Some minerals and crud can get caught in the aerator sometimes.
If it blasts out with the aerator out and the screen, then it points to the aerator some how. If it trickles out with the aerator out, then we have something upstream in the piping.
Try the kitchen faucet test on both the fresh tank & pump as well as city water.
If it is only happening on city water, then this points to the check valve/screen on the fresh water inlet port. I have had that check valve apart before and it might be stuck part way open. I'm guessing the city water port is in the bath room area. "IF" I have this right, the bath sink is the 1st in line, the shower, toilet is next and the kitchen is the last in the line. The pressure drop would be the smallest at the bath faucet and get larger the further away and through other small orifices allowing lower flow. The shower has a real small orifice in the vacuum breaker valve on top of the faucet where the hose screws on. Low flow can affect this area due to that small orifice. At least I think that is where your is on a 99 camper.
Hope this helps
Current Sunlines: 2004 T310SR, 2004 T1950, 2004 T2475, 2007 T2499, 2004 T317SR
Prior Sunlines: 2004 T2499 - Fern Blue
2005 Ford F350 Lariat, 6.8L V10 W/ 4.10 rear axle, CC, Short Bed, SRW. Reese HP trunnion bar hitch W/ HP DC
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