Load balancing or??

I have a RB1000. and want to make a something and don’t know if is it posible.
i have 2 internet service providers, where i got 32 IP’s from each, so i want to route these addresses and the connection to one network with 50 PC’s, so if one of these providers had problems with ping or no connection, the PC’s take connection from other ISP. without using BGP. is that possible? and how to do that? i’m reading about load balancing, but not sure if that is what i need? and which kind of load balancing can help me.
Thank you.