Go ahead an change the radiator hoses, they should be about $50 each. For the heater hoses going up front, if you get into a jam you should have two shutoff valves at the engine. As for the hydraulic hoses running up front, that's a big job to replace but you should have them carefully inspected to be sure they're not rubbing on frame edges etc.
Also, if you haven't already done so, change the belts.
I sprung a leak in my 26-year-old top radiator hose last year and had it changed out at a CG in Montgomery. $45 for the hose and $200 for the service call and a couple of jugs of coolant. It would have been so much easier and cheaper to just do it in advance.
If you have an Oshkosh/Freightliner chassis, call Freightliner and give them the last four digits of your VIN and they can sell you the parts of give you the part numbers.