the rr has too small of a forward jet. i'm sure it could be drilled out, but it's still a huge mass of metal body.
depending on the size of the line, i like to use a 3 or 4 forward to blast a hole and let the water drain. once it's partially open then i can let the power of the rr blast it clean. also when you know the proper distance out based on the initial stoppage. mark the hose with tape so you can repeat the cleaning mark.
you could also get a leader hose 10' long with a 1/4'' mip end and a 3/8'' fip on the other end made up. this will be a good choice as the rr will destroy a hose as it shoots all the sand and grit backwards. the 10' hose can easily be replaced or repaired. a hose/ hydraulic shop can easily make the hose for you.
the rr is a massive piece of metal. the front jet is not very large and will take a very long time to do enough penetration to allow the massive rear jet power to destroy the roots. even with my 4000 # 18 gpm machine i use a forward 1 -4 jet nozzle to open a hole and then go in with the rr or warthog. sometimes i'll use my cable first.
jetting a completely packed line will fill with water and diminish the jet blast as the standing water will absorb the impact. not to mention it can really make a mess as the water is now backing up. so getting it flowing first is the key. using a strong front penetrating nozzle or cable is key. once the rear jet can get to the roots, your problem is solved. there is nothing i've used that has the power of a root rangers blast. but you need to get the blast into/ onto the roots.
Thanks for the quick response Rick as always. Just a couple quick follow ups to make sure I have everything correct. So a jetter with those specs will run the rr as long as I put a 1/4" reducer onto the end of my 3/8" hose? Kind of like what the ridgid 3100 does? The second part about the forward penetration confuses me a little though. What if the line is plugged with roots? Isnt that the point of the RR? Thanks for the patience.
the rootranger at 4000 psi 6 gpm will eat the roots for lunch. you could go with the stock ridgid one that's jetted smaller, or get one from australia with a larger rotor #6 for your specs. as far as i know, the rr is jetted for either 1/4'' or 1/2''. so a 1/4'' rr with a reducer would be your best bet. but remember that a rr is not good for forward penatration if the line is already plugged even though it does have a very small front jet.