Larry -
As I have written several times, keep the engine RPM up. Don't slow down to "ease the load on the engine".
Actually, my concern is more with the transmission than the engine. I bet your Tahoe has an engine temp gauge, but does not have a tranny temp gauge. In my experience, the tranny overheats first, especially if you "slow down to ease the load".
As I recall, you load pretty heavily, both truck and TM. If you can talk yourself into it, you really should get a Scan Gauge (scangauge.com) or some equivalent device. It will read out all the parameters you care about, including tranny temp, in real time as you drive. About $150, simple plug-in installation. The confidence you will feel is worth it, all by itself.
Bill
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