This should help with the check valve fix if yours is made like this. Do not push that plunger in when pressure is on the system. It will blow out the O ring. I proved it, twice no less....
Does the toilet flush normal? The toilet uses more water then the faucet. The screens in the faucets and or the aerators get plugged with dirt/calcium easily. If the toilet flushes normal, then it points to something in the camper heading to the faucet being clogged.
Even try blasting water out the low point drains. If they blow hard with water, you need to be looking at the faucet itself. If the low point drains only let out a trickle, then you have a inlet issue some how.
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
Google Custom Search For Sunline Owners Club