40' class A pulling a 4-dr Jeep SUV so we're about the same length as the OP..
#1 - completely agree. merging into traffic must not be taught. more and more we're seeing merging cars suddenly stop...dead stop...at the bottom of the ramp. in urban areas where there are 3-lanes more often as not you'll find us in the middle lane keeping up with traffic.
#2 - i tend to move over into the passing lane to let traffic pass. i've noticed that many vehicles aren't ready to pass after i move over. i don't wait till the last minute to pull back left into the traffic lane, when i see the 1/2-mile warning sign i make my move..,earlier if there's a vehicle hanging back.
#3 - i usually drive 65 or the speed limit, whichever is iess and when less than 65 usually 3-5 mph over. but when i move left to pass...really rare it seems...i speed up. get over, pass, get back. sorry, but to remain at the posted speed in the passing lane when other traffic is in that lane behind you is just asking for trouble. i don't deny that i've been caught in the left lane. bad judgement on my part. that's rare but when it happens i get right ASAP.