SiruiCarbon Fiber Tripod Am-254 47.2" 10X With Ball Head A-10R,Stainless Steel Spikes,Case", Black (112505)

Can the am-254 hold a canon 70-200 2.8 steady enough for 30sec exposures? please only answer if you have experience trying this. thanks

Can the feet be replaced?

Is there replacement part for cap screw 1/4-20 thread or 5/16 in size?

Arca-swiss/ RRS compatible ?