Pulling 53' or tugging our little 19' TT, I take the same approach. Use the ramp to get up to speed, then merge. I will stop on that ramp if traffic is so heavy that merging is not safe ( I have to yeild, not them), but if there is room for traffic to move over...I am coming out. Traffic doing 70, me only doing 50 mph, Oh well, so sorry, go around or hit your brakes.
Tractor trailer or travel trailer---it takes a bit to get em moving. Momentum is your friend. Most people respect that, I am not afraid to force the issue. If you try and WAIT until absolutely no one has to slow down, or move over---You will never get onto the road. Pick a time were traffic can see you, have time to respond, then boldly step out.
More to the OP's point.... Typical merging from the right, normally allows you the ability to lean forward, back, or look out the window. Either will give you a differnt perspective, and eliminate many blind spots. Merging from the left will have more blind spots, so you need to recognize these approachs before you enter them, do a traffic "count", no where you plan to fit in, and be prepared that everything you think you saw may have changed by the time you get to the actual merge point.
Put your head on a swivel, and always have an alternative "out".