Wingnut's Surf Caddy Service... location of all SWAT spots included.
If you do want your own caddy, either bring a friend and say they have to carry the gear because they're fishing your spot and using your gear. Or... have your dad carry it because you did literally everything else and that's the least he can do. Both of those work for me!
The easiest thing when you do a solo trip is to leave your backpack and extra rod on the beach if you are wading. Just remember to turn around every few minutes to make sure nobody runs off with your gear.