Should I get a new truck or overhaul it?

I Own a restaurant and catering company in Baltimore Maryland. We have 4 custom made catering trucks that cost apx. $35,000.00 each. Our oldest truck, a 94' dodge dakota is starting to have alot of problems. The transmission is starting to shift very roughly, it doesn’t have much acceleration. The hood is starting to rust, I need new ball bearings on the front two wheels, and just yesterday the rpm gauge started acting very weird and somestimes dosent move at all. My question, should I replace this truck with a new truck that will cost $37,000.00, or spend 10,000$ to totally overhaul the truck.
You can view pictures of the truck at:

http://sorrentoscatering.com/s_53.asp

It is the truck with the pink lettering.

Thanks

It's really depend on your budget on your company. If you buy new truck and you will have less headache to repair your truck and lose time to get it repair, and also you need truck to do your business. If you overhaul the truck, you might spend more money repair than buy it new one. You can use tax write off either buy or repair. If I have money I would buy new one.