first i wouldnt use the sidewinder sct in a 4x4 sc truck. it would probably run hot. in my 4x4 sc i run a mamba max pro and a tekin sc4x motor. so if your on a budget get a cheaper servo and spend a lil more on the motor and esc. anyways check out this servo. it has good reviews but ive never tried it. [url=http://www.hobbypartz.com/60gexidise.html]60G EXI Digital Coreless Servo-D226F w/ Metal Gear[/url]
it apparently has 180oz/in at 6v.
you can also spend a little more for this servo. its a little more money and has less torque but it is a reputable brand... [url=http://www.amainhobbies.com/product_info.php/cPath/61_100/products_id/183310/n/Savox-SC-0252MG-Standard-Digital-Metal-Gear-Servo]Savox SC-0252MG Standard Digital Metal Gear Servo [SAV-SC-0252MG] | Radios & Accessories - A Main Hobbies[/url]
if your bashing anything with a decent size lug should be fine. i would pick the proline gladiators in my opinion. but the two tires you listed are perfectly fine.