If those 2 hoses are "Y'd" back into 1 hose before entering your RV it results is the same flow rate as 1 of the 2 hoses exiting from your pressure regulators. If I remember basic hydraulics class correctly, you cannot increase flow rate in the same diameter pipe/hose without increasing pressure. This kind-of explains my position: Garden hose pressure
On Edit: My above position does not apply to your original question about using "flow restrictors", as I noticed it after replying. It would be useless to use 2 flow restricters feeding 2 hoses, as previously advised, it would be better to either enlarge the opening in 1 flow restricter or eliminate them altogether.
2000 Winnebago Ultimate Freedom USQ40JD
, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member."We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert theConstitution. "Abraham Lincoln"