you would be able to keep it a total of 6 year's after you bought it
if you were to buy it new you would be able to keep it 10 year's
and register for more than 33,000 you would but it would half to have
3 axle's and be set up in proper matter to carry over 33,000,
some companies will pay for weight you are able to carry some won't
also depending how truck is set up to caarrier 13,000 lbs you may
need a tag axle to carry the weight so you will not be over weight if
have a load on.
some d unit are not able to carried required weight as truck is not set up right, there is too much weight on the front axle etc
if has to meet brigde law