Most tipping trailers from India i see on Youtube are modified truck frames, and are loaded with 8 to 12 ton of earth..
The only problem i had with 10 ton trailers with telescopic cylinder is that the first stage holds so much oil that the tractor gearbox doesnt contain enough oil to fully fill the tipping cylinder. But with a 5 ton you wont have that problem.
My 8 ton tipper is also an old truck tipper with the front end cut off,, but the oil pump from the truck is now PTO driven with a separate oil tank, independent of the tractor hydraulics.