I'd also see if the trailer might have some electric or inertia brakes; it'll save you on the downsides.

MAKE SURE YOU HAVE SAFETY CHAINS and a good spare for the trailer. <img src="/forums/images/graemlins/shame.gif" alt="" /> <img src="/forums/images/graemlins/shame.gif" alt="" /> <img src="/forums/images/graemlins/shame.gif" alt="" />

Trailer weight is one thing; the stuff you throw in is another. Get the tare weight at a local scale before you load; gross weight after, for total weight you'll be lugging.

I'd either take I 20 to I25 and north, or I15 to I80 and east. I70 has some pretty long steep grade from the west to Eisenhower Tunnel. Raton Pass on the NM/CO border has its steep spots, but isn't as long a grade.

Couple thoughts.