cannot maintain electric?

I'm assuming this is the main (30A) breaker? It will probably keep opening as it gets hot (weaker).
Has this happened before?
Is there low voltage (<105 volts) where you're plugged in?
Is the shorepower breaker opening also?
Do you have another power pedestal, generator or other source of power?

We're going to need more info. Line voltage, how many things are being run on electric, etc

You don't post enough information to give you an answer.
But, when we consistently pop breakers, we turn off the electric water heater. This usually solves the problem. People often forget it is on and then run the microwave and a/c or two other large load appliances, overloading the system.

Solution to tripping circuit breaker = reduce the load.

For more detailed assistance provide more detailed information.

You certainly need to provide more information. What is running (everything) when it pops? We had an old toaster that was getting bad that would pop breakers.
I carry a 30-50A adapter with so if I see on a really hot day only 30A rigs and all the AC is running if I have any issues with supply I change to the other circuit.
This would not be your solution. As mentioned it is a draw problem. You probably have a weak breaker. Especially if it is the main popping.

What are using to plug in ?
OEM 30 amp cord or are you running your own lightweight extension cord ?
If I use an extension cord, I use my 10 amp cord , going lighter, caused voltage problems.

All the following is based on the assumption it is the 30 amp breaker tripping. Since this is a common problem.
30 amp service is really inadequate in the 21st century with all the conveniences we now have & love so much. As a result we tend to over load the 30 amp breaker and the more it trips the weaker it gets. Also feel your 30 amp plug, very often it runs hot because the receptacle is worn out and not making a good tight connection causing voltage drop at the connection point and a lot of excessive heat. I have seem the 30 amp plugs actually melt. A 50 to 30 amp is a very good option if the 30 amp receptacle is worn out as I have never seen a worn out 50 amp receptacle in a pedestal. As advised check your line voltage, in the warm weather a lot of RV parks do not have adequate electrical power and line voltage drops to a level that is too low. Low line voltage makes motors like the A/C draw more current then they should and if too low will harm your compressor. You could switch your refrigerator and or water heater to propane to reduce the current draw. All this may be more than you wanted to know but I consider it vital to your problem if it is the 30 amp breaker popping.

Put your water and fridge to propane only. If the air is running use the hairdryer on low.

this may be a temp solution but mine does same thing if my ac runs for a long time it seems my breaker box gets to hot and it trips

I put a small fan in front of my breaker box where air could get in there and that helped with mine tripping

it should have a fan in there but it may not be working or it may not be coming on soon enough

Another good idea is to get into your breaker panel and make sure all connection are tight as they have a tendency to loosen up in a RV and will cause extra heat. A fan is a good idea as the manufactures usually sandwich the panel in a small enclosed space causing heat build up. In real hot weather I usually leave the wood door on the panel compartment open to allow some heat escape. I have plans to install a fan, but I only think about it when I need it and we seldom use our RV in the real hot weather. I prefer camping say October thru June then stay home July thru September.