1985 3500 dually ???

[88scottsdale]

Hi guys , I'am looking at getting a 85 RC silverado dually, Its loaded with all options for this year, 120,000 kms on the 454 400th, new tires, new exhaust tune up and brakes, runs like a new one. truck is from BC so its very clean 90% originial paint. one small crack in the passanger rear fender. it has the 5th wheel hitch in bach along with a regualar hitch out back. it also has a spray in bed liner. the inteior looks like new except the head liner is drooping a bit. the dual tanks both work.
So my question is how rare is this truck ???? and do you think is worth 5000 can.and is there any thing i should be look for ???
please reply as I'am going to look at the truck in am.