Re the last pic, I'd put the rear straps up higher if at all possible, and yes, as mentioned, angled towards the back to. The straight out positioning is OK but up higher if at all possible will yield better stability as it'll be providing some downward force as well, not just side to side.
Also, for all Tongue Weight specs in owners manuals, take note that there's usually an asterisk that states beyond what weight a Weight Distributing hitch is required to achieve that weight. You may be able to only put a 300# dead tongue load on the back of some vehicles for example, but with a WD hitch pull a trailer with a 800# tongue weight load.
Also, for all Tongue Weight specs in owners manuals, take note that there's usually an asterisk that states beyond what weight a Weight Distributing hitch is required to achieve that weight. You may be able to only put a 300# dead tongue load on the back of some vehicles for example, but with a WD hitch pull a trailer with a 800# tongue weight load.