Asking to move in together tips

I've been with my SO for a year, we don't live together, I still live with my mother, and he lives on base in the barracks (he is a marine). I make enough to get an apartment and pay the bills (rent, insurance, gas, food..) if I had a Roomate but I don't really know how to go about asking him if he would want to move in together... Right now he is currently in debt because he got into a car accident so I don't know how he would feel about it if I asked. Any advice/ tips on how to go about asking him