We have a 2014 bounder. We have no problem with the water. Have him make sure that he has it on city water setting.
My first guess would be to check the water filter, unless the problem doesn't happen when he uses the pump.
Also, it is possible that it is dribbling out because it is filling the HW tank (10 gallons). Once it is full, the pressure should return. And, open all the faucets to make sure all the air is out of the system.
When we first bought ours, these were the problems we ran into.
2015 Jeep Willys Wrangler
2014 Fleetwood Bounder 33C
States camped: all but Hawaii
more than 1700 days on the road