My sophomore year in HS while on the JV team we played against PV the year they opened and they only had a JV and freshman team. Their RB was a sophomore had to be a lot older and help back. He was at least 250 lbs. I played LB at 160 lbs. I had 4 solo tackles on him, three for a loss. When he saw them warming up, our coach said to go for the ankle and he will fall like a tank and he did. He was fast, but did not have the best agility, so it was easy to take him down buy going low. So, my only concern would be to have the guy fall on him and crush him.
*This HS is now called Gold Canyon. They closed the old PVHS for a few years and then reopened it. It was strange that they they did not have the names straightened out prior to opening them.