Use good quality hoses and you shouldn't have any leaks,it's the guys that cheap out on hoses that have leaks. Pretty well every piece of farm implement uses hoses to run cylinders etc.,and they generally operate in the 2,000+ psi range.
Over the road semi trucks with diesals have been using remote filters pretty well since they came on the scene.
City people that have never worked with hyd hoses worry more about leaks then any farm kid does,that grew up with high pressure hoses.City kids listen to the internet to much

The hemi's oiling system operates at roughly 70 psi,and even if you have a high volumn pump you might see 90 psi at most,decent hoses will handle that all day long and never leak.If you want good hoses,go to your local farm implement dealer and they can make up anything you want.