I owned a flatbed semi and did a lot of tie down, put one strap on rear axel on right side inside tire and pull back to right rear corner of trailer then one strap on right front axel inside tire to right front corner (be careful to stay away from steering components) and pull forward then go to left side and do same to left rear and left front of trailer.
Do not put a strap over hood or on frame where you sit or by engine, you can do serious damage as you bounce down road !
4 small ratchet straps will be more than enough to hold in place.
You will only have a problem if you get trailer upside down