5000 gallons of gas or diesel weighs about 40,000 pounds or so so your gross will probably be abouty 75,000 pounds going down the road. Brakes work ? Tires inflated ? Placards and MSDS as required ? Placarded trucks are definetely bear bait thesed days.
load of WVO at 7.5lbs per gallon, 5000 gallons- 37,500lbs.
Empty Trailer weight- 13,000lbs
Tractor weight (m81

- 19,644lbs
Total- 70,144lbs
WVO doesn't need placards. Before I start backhauling the bio blend (which is placarded) I would like to get a m915 and I still need my hazmat endorsement, so I'm studying for the test now.
Brakes are new, one air line to one can needs to be replaced it's fraying a little, other than that, they work great. Tires are brand new. I need to check out the wobbley one.
The trailer was basically parked after rebuild in 11/04.